The best teeth whitening kits for a sparkling smile (2024)

Teeth whitening kits use a mouth guard, an activating solution, a syringe of gel, and a UV light to help you achieve a more dazzling smile. Claiming to have more noticeable effects than other at-home natural teeth whitening treatments, these aren’t great if you suffer from sensitive teeth, but are good if you want to see more instant results.

Best teeth whitening kits at a glance:

• Best long-lasting kit: White Glo White Accelerator Blue Light Kit - view on Boots
• Best gel-free whitening kit: BlanX White Shock Power White Treatment - view on Boots
• Best top-rated teeth whitening kit: SmileTime Teeth Whitening Kit - view on SmileTime Teeth

It’s perhaps the most expensive form of teeth whitening, but compared to in-surgery professional teeth whitening treatment, a kit is much more affordable.

Check out our guide below to buying the best teeth whitening kits, from options with quick results, to gel-free kits. As well as this, we have a full FAQ section, answering all your burning questions on at-home teeth whitening and how to get the best results.

The best teeth whitening kits

What is PAP?

PAP, or phthalimidoperoxycaproic acid, is a relatively new ingredient used as an active bleaching agent in many teeth whitening kits instead of peroxide. It uses the same process of oxidation to whiten, breaking down stains to brighten the teeth, but is often considered a safer alternative for at-home use.

PAP still gives you that whitening effect but is considered to be less harmful compared to peroxide; peroxide is more likely to cause sensitivity to your enamel and release free radicals that will irritate your gums.

If you're unsure of the effectiveness, PAP formulas have been scientifically proven to whiten and brighten teeth after a few uses, as shown in the clinical trial study by the Journal of Applied Oral Science.

How to use a teeth whitening kit

With each teeth whitening kit, make sure to follow the specific instructions for the treatment, as different kits can vary in their application and required frequency. However, as an overview, you’d typically use a kit as follows:

1. Brush your teeth, with a regular or teeth-whitening toothpaste, and rinse the mouthpiece with water
2. Syringe a thin layer of gel into the top and bottom of the mouthpiece
3. Pop it into your mouth and turn on the LED
4. Leave in your mouth for the allocated time
5. Remove, spit and rinse after use

Are home teeth whitening kits safe?

An at-home teeth whitening kit is a safe teeth stain remover, as long as you use it as outlined, checking for any safety advice listed. For example, some kits are not suitable for anyone under the age of 16 and can’t be used if you are pregnant, breastfeeding, have overly sensitive teeth, or have existing dental concerns.

Always make sure to do your research before purchasing to make sure you're getting the best teeth whitening kit. Check the ingredients list if you have any known allergies. And, of course, if irritation occurs, stop using the treatment. It’s recommended to seek advice from your dentist before undertaking new treatments if you’re in any doubt.

Does whitening damage teeth?

According to the NHS, as with any teeth whitening product, there’s a chance your gums will be sensitive to the treatment. You should always make sure that the mouthguard is fitted properly. Also, make sure that no bleaching gel leaks out of your gums as this can cause blistering, sensitivity, and damage to tooth enamel.

How long will teeth whitening last?

The best teeth whitening kits can produce results that last anywhere from a few months, to a year or longer, when combined with proper oral hygiene.

However, if you want even longer-lasting results, it’s recommended to receive professional teeth whitening via your dentist. Some dentists offer at-home teeth whitening kits designed similarly to the ones listed above. While it is much more expensive, the treatment comes with custom-made trays and dentist supervision. Plus, its gel solution is more concentrated, meaning more beneficial results.

Eleanor Weaver is the Deputy Homes & Garden Product Editor for Yours, specialising in home décor, furnishings and appliances. Having worked commercially on Yours magazine and Yours.co.uk for the past six years, she's previously hosted Yours Live events and loves looking for home inspiration online.