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Smile Avenue Teeth Whitening Kit Review and Product Information


Teeth whitening has become very popular in the UK, but not everybody wants the expense and inconvenience of visits to the dentist. Teeth whitening kits are a more affordable way to get your teeth several shades whiter. However, there are so many kits on the market, how do you know which is best for you?

smile avenue whitening kit
This complete whitening kit is popular in the UK

In this article we are going to introduce and review a popular whitening product in the UK: Smile Avenue Professional Teeth Whitening Kit. We'll explain:

  • What's in the Smile Avenue teeth whitening kit?
  • What ingredients does the gel contain?
  • Is it safe?
  • Is it easy to use?
  • What kind of results can you expect?
  • Where can you purchase the kit and refills?

You can also read reviews of Smile Avenue's whitening kit from other users to help you decide if this is the right product for you.

Introducing the Smile Avenue whitening kit

This teeth whitening kit from Smile Avenue has already earned a good reputation in France and is now gaining popularity in the UK. It contains everything you need to whiten your teeth by three shades or more from the convenience of your own home. Even if you have never used an at-home whitening kit before, you should find it very easy to get good results with this kit.

best whitening kit 2020 uk

The main highlights of the Smile Avenue kit are:

  • Made in the US with high-quality ingredients
  • Conforms to the relevant EU regulations
  • Gentle whitening gel formula
  • Includes 30ml of whitening gel
  • Easy to use
  • Visible results in a few days
  • Convenient treatment: 20-30 minutes per day for 10-14 days
  • Great value
  • 100% money back guarantee

Our overall rating: ★★★★★ (5/5 stars)

Smile Avenue teeth whitening kit reviews and features

Below we explain what makes this our choice for the best teeth whitening kit of 2020.

Kit contents ★★★★★ (5/5 stars)

Smile Avenue's teeth whitening kit contains everything you need for a professional whitening experience at home:

safe teeth whitening uk smile avenue
Smile Avenue is a complete at-home whitening solution
  • 3 x 10ml syringes of whitening gel
  • 17 ml pre-treatment cleaning spray
  • A fixed-shape mouth tray with built-in LEDs
  • A shade guide so you can check your progress

Many kits on the market only contain 10ml or 20ml of gel, whereas this kit's generous allowance means you might have some left over to top up your results at a later date (depending on how long your initial treatment takes).

Once your initial supply is finished, you can buy gel refills which work out at just over £1.50 per treatment for ‘top-up' whitening. So this kit is an affordable way to keep your teeth brighter over a longer period of time, too.

The cleaning spray is another bonus item not found in many other kits. Using this before applying the gel helps remove surface stains so the gel can get straight to work whitening the teeth themselves.

Smile Avenue's whitening kit features an innovative mouth tray design. Rather than attaching an exterior LED light, this design has built-in LEDs to achieve better coverage.

Ingredients ★★★★☆ (4/5 stars)

When you're comparing teeth whitening kits, it's important to check the ingredients used in the gel and the country of origin. A poorly formulated gel can cause tooth sensitivity and gum irritation. Some gels are produced in countries which have sub-standard quality control and regulations in place, but Smile Avenue's kit is manufactured in the US and conforms to EU regulations for cosmetic products.

Here is the ingredient list for the whitening gel: Glycerin, Propylene Glycol, Carbomer, Mentha Piperita oil, Triethanolamine, Mica, Sodium Carbonate Peroxide, Aqua, Sucralose, Limonene

The active ingredient, sodium carbonate peroxide, is a gentler alternative to hydrogen peroxide. Hydrogen peroxide is the main ingredient used by dentists for professional whitening, but it often causes tooth sensitivity. We didn't experience any pain or burning sensation when using this kit, although some users have reported slight sensitivity. If you're worried about this, you can start by using it for 20 minutes at a time and build up to 30 minutes if it's comfortable to do so.

It's reassuring to know Smile Avenue's gel has been formulated to maximise results without harming enamel and gums.

Ease of use ★★★★★ (5/5 stars)

We would give this six stars if we could, because it's so easy to use. Some whitening kits come with a thermoforming mouth tray, which you have to place in boiling water and then mould to the shape of your teeth before using it. With this kit, the one-size-fits-all mouth tray is ready to use straight away.

There are four simple steps to use this product:

best teeth whitening kit uk

“Application quite simple by following the instructions as indicated on the box. Good value for money when compared to the dentist!”

“It’s really easy to use… the last kit I had you had to mould the trays to your teeth and I couldn’t get it right. This one you just put the gel in the trays, clip on the light and you’re ready to go.”

-Smile Avenue reviews

The LED mouth tray plugs into your phone or laptop for power, so you can continue working, browsing or streaming while during the 20-30 minute application (bonus: no batteries to replace). It's so easy to fit this into your normal day. We found it best to use after eating and brushing our teeth at night, so we didn't eat or drink anything after the whitening.

You should continue using the kit for 10-14 days. There is enough gel for 15 applications, so if you have some left over, you can keep it to ‘top up' your white smile another time.

Results ★★★★★ (5/5 stars)

We only had to use this kit for a few days to see noticeable results, which was a nice surprise! Using the shade guide included with the kit, we measured 3 shades of whitening by the end of the treatment.

It's effective at removing stains from yellow teeth from things like tea, coffee and tobacco. Many reviewers on Amazon.fr and Amazon.co.uk mention similar delight with their quick results:

“I hesitated before investing in this type of product but I am not disappointed with the result. As a former smoker, I noticed a slight yellowing on my teeth that concerned me. I have not completed the recommended 14 days of treatment yet but I already feel that the improvement is visible.”

“Just 20 minutes a day and already after 4 days I saw a difference. My teeth are whiter, brighter. Thank you for the simplicity of use and especially the effectiveness of the product much cheaper than a whitening session at the dentist.”

“I am quite a heavy coffee drinker so teeth stain very quick and from now on planning to use this kit as it is a great price for what you get.”

“Distinct changes after about a week to 10 days.”

-Smile Avenue reviews

You can find Smile Avenue on Amazon, but we recommend purchasing directly from their website where you'll get free shipping and an extra 10% off when you use code DENTA10. This discount applies to your entire order, so you might want to grab a couple of refills while you're there.

Alternatives to this kit

Very Good Smile Professional Teeth Whitening Kit

We think Smile Avenue is a great choice if you want a standard teeth whitening kit around this price. For a more premium whitening kit which gives professional-looking results for up to a year, consider Snow. Their proprietary technology makes their kits completely different to most others on the market. Read more in our full review of Snow whitening or visit their website and get 20% off with discount code BDAY.

For a kit at a slightly lower price, we recommend this kit offered by Very Good Smile. It provides similar results, but the kit only contains 10ml of whitening gel (with a different formula) and doesn't come with the pre-treatment cleaning fluid, so it's not such good value overall.

Read our separate review of Very Good Smile whitening kit to find out why it's another of our top recommendations for teeth whitening kits in the UK for 2020.

You might be tempted to try one of the bigger names on the market, like HiSmile. You can read our full review of HiSmile here to see how it compares to Smile Avenue, but in short, it gives you less for your money and relies heavily on celeb endorsements.

iWhite is another well-known brand, but as you can read in our iWhite review, their kits are quite wasteful environmentally and financially. Plus, you're extremely unlikely to get the ‘up to 8 shades of whitening' they shout about so much.

We've also written reviews on GlamWhite and Billion Dollar Smile. You can check them out for more details, but overall we believe Smile Avenue gives the best value for money and results.


Smile Avenue teeth whitening kit is our top pick for 2020 because it gives great results for an affordable price but, more importantly, it comes with the reassurance of high-quality, strictly regulated ingredients. The generous 30ml of whitening gel and the extra cleaning solution are just the icing on the cake!

If you want a kit that you can re-use at a later date without having to buy the whole bundle again, you'll be happy to know Smile Avenue gel refills are available to buy here.

You can purchase this kit with complete peace of mind, because it comes with a 100% money back guarantee if you're not satisfied. Plus, Smile Avenue's customer service team is on hand to answer any questions you have or help with any issues.

Don't forget to use code DENTA10 at the checkout to get an extra 10% off everything on their website:

Smile Avenue Teeth Whitening Kit Review and Product Information
4.2 (83.08%) 13 vote[s]

Amanda Napitu
Amanda Napitu
Amanda Napitu on FacebookAmanda Napitu on LinkedinAmanda Napitu on Website
Amanda specialises in writing informative content about dentistry. She has been a regular contributor to Dentaly.org since 2017.
Amazon.fr: Smile Avenue product listing and reviews. Consulted 18th March 2019. European Commission: REGULATION (EC) No 1223/2009 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL. Consulted 18th March 2019.