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How to Maintain Children’s Oral Health and Prevent Tooth Decay in Kids

Amanda Napitu
Amanda Napitu
Medically reviewed by
Dr. John Will
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As a parent, it's natural to want your children to be healthy – and that includes their teeth. But sadly, tooth decay in children is relatively common in the UK, affecting almost half of children by age 8. While you can take steps to prevent things like early childhood carries, cavities and gum disease, some other children's oral health problems can happen at any time.

As soon as your child's first tooth appears you have a part to play in keeping their mouth healthy, so it's a good idea to be informed about dental care for babies and children, and all the things that might affect them in the future. Knowing the symptoms of common dental problems means you can identify them early on and seek treatment before they develop too far.

In this article we'll answer some questions that many parents have about caring for their children's teeth and mouth, including:

  • Do baby teeth really matter?
  • How can I protect against tooth decay?
  • What are the signs of gum disease in children?
  • Is it normal for babies and children to get mouth ulcers?
  • How can I relieve mouth ulcer pain?
  • How do I know if my child needs braces?
  • What should I do if my child's tooth is damaged or knocked out?

You'll also discover how your child's oral hygiene routines should change during the different stages of their life – from baby to toddler to school age.

This infographic shows some of the most important points relating to this topic: the problems to look out for and ways to keep children's teeth healthier. After this you'll find lots more in-depth information to help you improve your child's oral health.

We hope all this information gives you more confidence when it comes to dental health for your child. Getting it right now will help them develop healthier habits as they grow up, so it's worth investing the time early on.

Children's dental health

The importance of baby teeth

You might be wondering how much milk teeth really matter, since they're only temporary anyway. Well, there are are several reasons why baby teeth need just as much care as adult teeth.

Child with rotten teeth
Black teeth don't look or feel good
  1. Pain and discomfort: If you've ever suffered with toothache yourself, you'll know how unpleasant it is. If your child's teeth become rotten, they'll be suffering with that pain until the teeth fall out or are removed. Bear in mind that the last of the baby teeth can remain until age 12 or 13.
  2. Appearance: There is nothing cute about a child with a smile full of black teeth. Even if they don't seem that bothered by them, other people are bound to notice and this may lead to teasing at school.
  3. Speech: We need our teeth to help us pronounce words properly. If your child is missing some baby teeth for an extended period of time, it may affect their speech development.
  4. Healthy adult teeth: Baby teeth have a direct effect on permanent teeth in a couple of ways. Firstly, they save space for the adult tooth to erupt into. If the baby tooth is removed early, other teeth can fill that space, causing problems with the eruption of the adult tooth and increasing the chances of needing braces. Secondly, if decay spreads deep enough into the root of the baby tooth it can actually reach the adult tooth tucked up underneath it – even before that tooth has erupted.

Despite all of this, in 2016-17 an average of 170 under-18s were admitted to hospital every day to have teeth extracted in England alone. In the video below, one dental surgeon discusses this problem with the BBC and reveals that she regularly has to remove all 20 milk teeth from 2-year-olds under general anaesthetic.

She also makes the point that if your child's first experience with the dentist is a negative one, they are less likely to want to visit again in the future – even as an adult. But start young with preventative care and dental checkups won't become a big ordeal. The same goes for tooth brushing; if you instil good habits while your child is young then there is a better chance of them continuing these into adulthood.

More than just teeth

Remember that oral health isn't just about teeth. Your child's gums and the soft tissue in their mouth also contribute to their overall oral health so it's important to keep an eye on those areas too.

The table below gives a brief overview of some of the oral health problems children might experience, including symptoms, treatments, and measures for prevention. Following this you can discover more about each of these issues and learn about other ways to protect your child's teeth.






Tooth decay

Poor oral hygiene, high-sugar diet

White, brown or black patches on teeth, depending on severity

Fluoride varnish, filling or extraction, depending on severity

Follow good oral hygiene practice and minimise sugar in diet, especially snacks

Mouth ulcers

Mild infection, sometimes another medical condition

Small, round white sores inside the mouth

None required unless linked to another problem

Not always preventable but avoid damaging soft tissue in the mouth

Gum disease

Poor oral hygiene

Red, sore, swollen or bleeding gums

Professional teeth cleaning, improve oral hygiene

Follow good oral hygiene practice

Tooth grinding

Various including airway obstruction, stress and anxiety

Audible grinding noise, constant headache, sore jaw in the morning

Depends on the cause but may include using a mouthguard

Depends on the cause, not always preventable

Misaligned teeth

Genetic factors, early loss of baby teeth, thumb sucking

Teeth crooked or don’t meet properly when biting

Orthodontic braces

Not always preventable but discourage dummy use after age 1 and thumb sucking

Tooth decay in children

We'll start with arguably the biggest dental problem for children in the UK: tooth decay (or ‘dental caries', to give it its proper medical name).

Almost half of British children (46%) have some level of tooth decay by age 8, and just under a third (31%) develop cavities by age 5, according to 2018 statistics from the Oral Health Foundation. Further figures from Public Health England reveal that 12% of 3-year-olds have visible dental decay, affecting three teeth on average.

Given that NHS dental care, including preventative care, is free for children up to age 18, these figures needn't be so high.

What causes tooth decay?

black teeth child
Watch out for sugary drinks in bottles and sippy cups

Bacteria in the mouth form a sticky coating on the teeth called dental plaque. They feed off sugar found in the food and drink you consume, producing acid in the process. This acid, if allowed to sit on teeth for too long, starts to erode the surface. Over time this results in holes, or cavities, which spread to the inner parts of the tooth and cause toothache.

Sugary foods and drinks are one of the main risk factors associated with tooth decay, and the risk increases when sugary snacks are consumed between meals. Young children who are given sweetened drinks in a bottle or sippy cup at night or throughout the day often develop decay in their upper front teeth. This is sometimes called ‘baby bottle tooth decay'.

Plaque disclosing tablets can be useful for showing you where plaque is building up on your child's teeth. The chew tablets contain a dye which colours plaque on teeth. Seeing it that clearly can help encourage better brushing!

Signs of tooth decay

The early stages can be hard to spot unless you know what to look for, so it's important to visit the dentist regularly. The longer the decay is left to develop, the more complicated it is to treat. Catching it early will make the experience much less traumatic for your child.

Dental caries may first appear as a white line along the gum or white or brown spots on the teeth. As it advances, more noticeable brown or black areas will appear.

Treating dental caries in children

dental checkup child
Dentists can spot early stage tooth decay before it becomes more serious

If your dentist spots early stage tooth decay they might simply apply a fluoride gel or varnish, which helps strengthen tooth enamel. This naturally fights decay without affecting the structure of the tooth.

Even while teeth are healthy, preventative measures can be taken by applying pit and fissure sealant, a non-invasive and pain-free procedure which reduces the chances of developing decay on biting surfaces of the teeth.

If the decay has developed further, your child may need a tooth filling. This involves removing the rotten part of the tooth and filling it with a white or metallic material.

Extraction is a last resort but it may be necessary if the decay is widespread. Often children are admitted to hospital to have teeth extracted under general anaesthetic, particularly where multiple teeth are affected. In 2013-14, this was the number one reason for the hospitalisation of children.

Ask a dentist: Sedation dentistry for children

Every kiddo is different and not every kid is 100% comfortable at the dentist. Some kids just don't have the ability to sit still or follow instructions well enough to get the dental care they need. In these cases, sedation dentistry can help. The 3 most common options available are:

  1. Oral Conscious Sedation – The “lightest” sedation available. Think of it like the difference between “light” and “deep” sleep. Best for shorter treatments with nervous patients. Commonly used along with laughing gas. 
  2. Intravenous (IV) Sedation – A flexible “middle-ground” that can be adjusted to meet the needs of a variety of patients. Deeper IV sedation is commonly used in teens who need their wisdom teeth out. 
  3. General Anesthesia – The deepest form of sedation where the patient is completely “asleep.” Best for patients who simply can't be awake during treatment or for longer and more involved treatments.

Dr. John Will, Children's Dentistry of Charlottesville

Preventing tooth decay

care for baby teeth
Teeth need care as soon as they appear

There are two main factors that contribute to tooth decay in children: diet and oral hygiene. You might think that it doesn't matter too much what your child eats as long as they brush their teeth properly afterwards. However, a 2017 study showed that tooth brushing can actually only do so much to combat a poor diet.

Children under 5 who snack all day rather than eating proper meals are twice as likely to develop tooth decay than those who have regular meals, the study showed. And of course, a high-sugar diet is known to be detrimental to dental health.

Simply put, tooth brushing alone isn't enough to keep children's teeth in good health. It also matters what they eat and drink during the day.

Further down in this article you'll find information on:

  • How to brush your child's teeth properly
  • How controlling their diet will reduce their chances of tooth decay
  • Other tips for keeping teeth healthy

We have another article which covers more about tooth decay causes, treatment and prevention.

Other children's oral health problems

Aside from tooth decay, there are plenty of other oral health problems your child might experience. Below we describe some of the most common.

If you have questions about your child's oral health or something is concerning you, you can use JustAnswer to chat online with a dentist now. Based in the US, their fully-qualified dentists are ready to offer professional advice about anything relating to your child's teeth and mouth.

Mouth ulcers

canker sore child
Ulcers can appear anywhere in the mouth

It's quite common for children to get mouth ulcers at some point, especially between the ages of one and three. Also called canker sores, these usually appear as white, round sores on the tongue, gums and soft tissue in the mouth.

Mouth ulcers in children are usually nothing to worry about and will clear up in a week or two. During this time your child may find it uncomfortable to eat. Avoid very sweet, salty and spicy foods to minimise any pain.

There are, however, some cases where mouth ulcers are a symptom of another problem – especially if more than one or two appear at a time. If your child is in severe pain or shows any other worrying symptoms then seek further medical advice.

Children's mouth ulcers sometimes occur when a cut in their mouth becomes infected. You can minimise the chances of this by making sure they don't put anything sharp in their mouth.

Our full guide to mouth ulcer treatment has lots more information on what causes them and how to relieve any discomfort.

Gum disease

Gum disease in children is much less common than in adults, but it can still occur. You might notice your child has red, sore, swollen or bleeding gums, which often makes it uncomfortable for them to eat.

If you spot any of these symptoms, take your child to the dentist. Your dentist will assess their symptoms to determine how far the disease has developed.

When caught in the early stages (known as gingivitis), treatment is quite straightforward. Your child may need a professional tooth cleaning, but after that it's just a case of maintaining good oral hygiene.

If left for longer, a more serious condition called periodontitis can develop. At this stage, tooth loss is more likely and gums can become severely infected.

Read more about how to identify and prevent gum disease and what to do if your child has bleeding gums.

Tooth grinding

According to The Bruxism Association, at least 20% of children under age 11 are affected by tooth grinding (bruxism). Since some cases go unreported or unnoticed by parents, the true number is probably higher.

custom full mouth guard
A mouth guard can protect teeth from grinding at night

There is no single cause of bruxism in children. It could be something physical, such as an airway obstruction, but it may also be a result of stress or anxiety, for example, because of bullying at school.

Children who grind their teeth at night may show behavioural problems associated with lack of sleep. They may also complain of a constant dull headache or a sore jaw in the morning.

Even if you don't hear the grinding itself, mention it to your dentist if you notice these symptoms. They may recommend a mouth guard for teeth grinding to help resolve the problem.

Tooth grinding should stop once your child has all their adult teeth. If it continues beyond this point your dentist can advise you about possible treatments.

For more information about teeth grinding causes and solutions you can read our full guide.

Misaligned teeth

Once your child's permanent teeth start erupting, you're bound to notice how straight (or not) they are. There are a number of factors that may cause crooked teeth, including:

If your child's teeth seem to be growing in crooked, try not to worry too much. They may well straighten themselves out as the mouth continues to grow and develop, but even if they don't there is the option of orthodontic work to straighten teeth. Equally, adult teeth that erupt perfectly straight can later move out of alignment because of overcrowding or some other factor.

braces for children
Straighter teeth are easier to clean

It's important to take your child for regular checkups so your dentist can monitor how their teeth are growing. If they develop a malocclusion (misaligned teeth) then your dentist may recommend braces. Getting your child's teeth straightened won't just improve the aesthetic appearance; it also makes teeth easier to clean, reducing their chances of oral health problems later in life.

Depending on the severity of the malocclusion, you may be eligible for metal braces on the NHS. Otherwise, you'll need to pay for private treatment. There are also more subtle ways to straighten teeth, including clear braces and invisible aligner braces like Invisalign Teen. These are a great option if your child is worried about being bullied for wearing traditional “metal mouth” braces.

Find out more about the different kinds of braces for children and discover what the criteria are for NHS braces.

Chipped or cracked tooth

Teeth can become chipped or cracked for a number of reasons. It might be a fall or accident, biting down on something hard, or a weakened structure because of decay or enamel erosion.

Treatment will depend on how serious the damage is. For small chips, dentists can usually just file down any sharp edges to prevent injury inside the mouth. For larger chips, they can often rebuild the tooth structure with a composite material.

If a tooth is badly damaged, extraction may be the only option.

Tooth knocked out

child tooth knocked out
A dentist may be able to save a damaged or knocked out tooth

While most of the problems on this list are preventable to some degree, this one definitely isn't. Sometimes accidents happen and one or more teeth may be knocked out completely.

Here's what to do if your child's tooth is knocked out:

  • Get to a dentist as soon as possible (you may need to make an emergency appointment or go straight to A&E)
  • Retrieve the tooth if possible and keep it in a glass of milk
  • Don't try to place a baby tooth back in the socket as this may damage the adult tooth underneath

The sooner you get medical assistance, the better the chances that the tooth can be re-implanted.

If any of these problems are affecting your child and you're unsure of the best course of action, why not ask a dentist? Using JustAnswer, you can connect with a qualified dentist in the US and get professional advice, without having to leave home.

How to keep children's teeth healthy

If you want to avoid preventable diseases like dental caries and gingivitis it's important to establish a good oral hygiene routine with your child. You also need to control how much sugar they consume, and how often.

How to brush your child's teeth

As soon as a baby's first tooth appears, it needs to be brushed to protect it from decay-causing plaque. If you'd like some help picking a toothbrush that's safe and effective for your baby or child, our kids' toothbrush guide has information on the best brushes for different ages.

Use a toothpaste which contains fluoride, a mineral which helps strengthen enamel and fight decay. Fluoride concentration is measured in parts per million (ppm). Children should use toothpaste containing at least 1,000ppm fluoride up to age six, and 1,350 – 1,500ppm thereafter. You can read more about baby and kids toothpaste to discover some suitable options for your child.

It's important young children don't swallow fluoride toothpaste since this can lead to a condition called dental fluorosis. Teach them to spit after brushing and use just a smear of toothpaste until they are three years old. After that, use a pea-sized amount.

brush child's teeth
Ensure good brushing by supervising until age 7

Just like adults, children need to brush for two minutes, at least twice a day – including just before bedtime. Spend 30 seconds concentrating on each quadrant of their mouth, and ensure every surface of each tooth is cleaned thoroughly. Don't rinse or drink water straight after brushing, since the ingredients in your toothpaste work best if they stay on the teeth for a while.

As your child becomes more independent they will want to get more involved with brushing their teeth. Let them hold the toothbrush as you brush so they get used to the correct movement. Their first attempts to try it themselves won't be very thorough, so make sure you go over everything again afterwards. You should supervise brushing until age seven to make sure your child has the correct technique.

If it's a struggle to get your little one to stay still for two minutes, you're certainly not alone. A recent survey found that 12% of children brush their teeth for less than 30 seconds, while 58% don't exceed 1 minute 30 seconds. It seems these kids find it ‘boring', and they will resort to crying, fibbing and bargaining in order to avoid this routine task.

Consider using a kids' electric toothbrush with a built-in timer to help keep your child focused. Some models come with an app that features fun cartoon characters and tracks your child's milestones. Alternatively, play a two-minute video, like the one below, while they brush.

Avoiding sugary foods

As we mentioned above, good oral hygiene is only part of the solution to preventing decay. Your child's diet also has a direct impact on the state of their teeth. In particular, sugary and starchy foods encourage the growth of the bacteria which causes rotten teeth.

Frequency is just as important as quantity here; giving a sugary drink or treat once or twice a day with a main meal is less damaging than allowing frequent sugary snacks and drinks throughout the day.

Here are some ways you can limit exposure to sugar:

fruit juice teeth
Even ‘healthy' fruit juice can damage teeth if drunk frequently
  • Don't let your child snack on sugar-rich foods like biscuits, sweets, flavoured yoghurts and cereal bars throughout the day.
  • If your child needs snacks between meals, offer foods that are low in sugar and starch like vegetable sticks or cheese (more ideas in the table below).
  • Fruit juice and dried fruits might seem like a healthy snack but they are very high in sugar. Offer as part of a meal rather than as a snack.
  • Get your child used to drinking water between meals if they are thirsty.
  • Don't give sugary drinks in a bottle or sippy cup since these result in more contact with the teeth.
  • Ideally, don't give them milk at night after they have brushed their teeth, since even milk contains natural sugars. If they rely on this to get settled, certainly don't add any sweeteners like chocolate powder.

We know that in the real world you can't stick to all of these all the time. Especially if your child is used to grazing on sugary snacks all day, it will take some time to wean them onto a healthier alternative. But now you're aware of the things that are most detrimental to your child's oral health you can make more informed decisions about what they eat and drink.

When they start school

When your child starts school or goes back to school after the holidays, it can feel like you're relinquishing some control over their oral health. It's true that you can't stop them from sharing a friend's chocolate bar or bag of sweets, but you can at least make sure you're sending them off with a tooth-friendly lunchbox each day.

Here are some ideas for tooth-friendly lunchbox snacks – and some to avoid:

Pack these:

Avoid these:

✅ Crunchy vegetable sticks

❌ Crisps

✅ Cheese cubes

❌ Biscuits and cake

✅ Rice cakes

❌ Chocolate and sweets

✅ Fresh fruit

❌ Dried fruit

✅ Seeds and nuts

❌ Cereal bars

✅ Plain popcorn

❌ Jellies

✅ Boiled eggs

❌ Flavoured yoghurts

✅ Unflavoured milk or water to drink

❌ Juice and other sweetened drinks

If in doubt, check the nutrition labels of any packaged food you buy to see how much sugar it contains. This website has some helpful information about what to look for and how to make healthier choices.

And should children brush their teeth at school? Back in 2014 the National Institute for Health and Care Excellence (NICE) caused some controversy by suggesting children should have teeth-brushing sessions at school because of the prevalence of tooth decay.

Most dental authorities recommend brushing at least twice a day. If you're cleaning your child's teeth properly in the morning and before bedtime, there is no need for them to brush at school as well. However, there is no reason why they can't take a toothbrush and brush after lunch, if they feel comfortable with this.


Although tooth decay is a big problem for children in the UK, there are plenty of other dental conditions that may affect them. Be aware of the symptoms so you can take action as soon as you notice something is wrong.

The two biggest factors in keeping your child's teeth healthy are proper brushing and a low-sugar diet. Here is a reminder of the tips given in this article:

healthy teeth kids
Try to develop good habits from a young age
  • Take your child for regular dental checkups – at least once a year or more often if advised – from age two or younger.
  • Get them used to brushing twice a day as soon as their first tooth appears.
  • Use a fluoride toothpaste appropriate for their age.
  • Only give sugary drinks and foods at mealtimes and offer low-sugar snacks between meals, if needed.
  • If they use a dummy, try to wean them by age 1 or as soon as possible after that to avoid a condition known as ‘dummy teeth‘.
  • Discourage thumb sucking as this can cause tooth misalignment.
  • Once they start school, pack a tooth-friendly lunchbox to minimise exposure to sugar during the day.

The earlier children get into these good habits, the easier it is and the more likely they are to keep them up as teenagers and adults.

If your child hasn't been to the dentist for over a year (or at all!), do them a favour and get a checkup booked today.

How to Maintain Children's Oral Health and Prevent Tooth Decay in Kids
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Oxford Academic Journal of Public Health: Positive association between sugar consumption and dental decay prevalence independent of oral hygiene in pre-school children: a longitudinal prospective study. Consulted October 2018.

Action on Sugar: Sugars and Tooth Decay. Consulted August 2018.

Public Health England: Sugars and Tooth Decay. Consulted August 2018.

Oral Health Foundation: National Smile Month: Strong Teeth Make Strong Kids. Consulted August 2018.

Oral Health Foundation: Urgent changes needed to combat appalling growth in child tooth extractions in England. Consulted August 2018.