One of the most common questions that our dentists get asked is “how long does teeth whitening last?”. The simple and short answer is that it varies.

There are a variety of different factors that that can impact the length of time that your teeth stay white – all of which we will be discussing in this edition of the Westside Dental Centre blog.

How Does Teeth Whitening Work?

different shades of teeth whitening

Tooth whitening procedures often involve two types of tooth bleaches: hydrogen peroxide or carbamide peroxide. The whitener is absorbed into the enamel where a chemical reaction breaks apart stains into smaller components and effectively dissolves them. The whitening gel creates an oxidation reaction in your enamel that remains effective for ~24 hours after application.

So, what does the LED light do? LED lights are used in dental whitening procedures because they speed up the chemical reaction that removes stains from your teeth. Keep in mind that the whitening gel will clean existing stains but will not offer protection again future stains. Tooth whitening can also be done at home with whitening products but the concentration of peroxide is not as effective and certain products could potentially harm your teeth and gums. Make sure to consult with a dental expert to learn about your tooth whitening options!

Factors That Affect The Duration Of Tooth Whitening

coffee staining a womans teeth


What we eat and drink has the biggest impact on how our teeth look. Things like coffee, red wine, and pop are common culprits for staining your teeth. Another lifestyle choice that affects the colour of your teeth is smoking. Tobacco penetrates deep in your enamel and causes yellow/brownish staining. For the best teeth whitening results, try your best to avoid staining foods and smoking tobacco.


As we age, our tooth enamel continues to gradually thin out. With a thinner layer of enamel, the inner dentin layer is more exposed and results in your teeth starting to look more and more yellow. Therefore, a teeth whitening procedure will inevitably last longer for a younger person compared to someone who has a much thinner layer of tooth enamel from aging.

Type Of Whitening Treatment

Depending on the type of whitening treatment that you get, the results and the duration can vary significantly. DIY or at home whitening treatments will typically not last as long because the concentration of peroxide will be much lower than with a professional teeth whitening treatment. Secondly, you can buy take home whitening kits from your dentist which will do a better job cleaning your teeth but come with a much more expensive price tag. Lastly, you can get a professional teeth whitening with your dentist. A professional teeth whitening procedure will be more accurate to the shade you’re looking for, will not cause adverse effects, and will last significantly longer than both other options.

What Are The Benefits Of Tooth Whitening?

a woman smiling after her dental treatment

Compared to DIY teeth whitening kids and over-the-counter whitening options, a professional teeth whitening can achieve the results you’re looking for quickly and effectively. Some of the benefits of a professional dental whitening treatment compared to other alternatives include:

  • Precise Shade Matching
  • Long Lasting Results
  • Safer Treatment
  • Dentist Approved Advice
  • A Brighter & Whiter Smile
  • Improved Self-Esteem
  • Better Oral Health
  • Quick & Effective Treatment

For the best results, teeth whitening should be left to the professionals. Dentists are trained to provide safe and effective treatment without the need for over-the-counter products. A dentist can also provide you with guidance and direction for how often you should get your teeth whitened and how to properly take care of your whitened teeth.

How Long Does Teeth Whitening Last?

how long does teeth whitening last?

As mentioned before, the results vary based on several different factors. However, the average lifespan of a professional teeth whitening treatment can last anywhere from 6 months to 3 years.

At Westside Dental Centre, we strongly encourage our patients to use tooth whitening in tandem with a health oral health routine. The best way to keep your teeth healthy and white is to have good habits, see your dentist regularly, and to brush and floss daily.

Do yourself a favour and avoid the cheap over-the-counter products and invest in a solution that will provide you with the results that you’re looking for. We are here to provide professional dental whitening for long-term results that you’ll love. Contact us today to set up a consultation and to learn more about our teeth whitening treatment.