Click here to see the Story in Metropol Magazine October 2024 Issue

Teeth whitening is a popular and growing beauty trend, and a treatment I am frequently asked questions about. 

However, with so many whitening products and providers available, it can be hard to know which ones are safe, effective, and won't leave you out of pocket. 

There are two methods used for teeth whitening: in-chair whitening and home kit whitening. 

Before 2012, tooth whitening was unregulated, but the EU passed legislation stating that only dental professionals can deliver teeth whitening, provided they have received the proper training. Even as a dental hygienist, I am regulated by the DCNZ guideless around tooth whitening. If you see teeth whitening offered in a shopping mall or your local beauty salon, it is illegal. 

The EU has set a limit on the amount of active ingredient used in whitening products, which is important to consider. The active ingredients, Hydrogen Peroxide or Carbamide Peroxide, were once as high as 38%, but the maximum amount allowed now is 6% for Hydrogen Peroxide or 16% for Carbamide Peroxide. These two chemicals are the only ones that can change the color of your teeth. 

So how does it work? These ingredients cause a chemical reaction in the teeth that breaks apart the carbon bond that creates yellow stains. Once the bonds are broken, they no longer reflect a yellow colour. 

Which whitening method is best for you? 

It simply depends on your preference. 

In-chair whitening requires you to sit in the dental chair with the whitening agent applied to your teeth and a light used to accelerate the product for approximately an hour. Your teeth will be noticeably whiter after treatment, but you will still need to whiten them at home to improve the efficiency. This option is great if you need an immediate result, however, it requires further whitening and maintenance, and will cost more due to the surgery time required and extra materials. 

Home whitening involves skipping the hour in the dental chair and simply having two custom-made whitening trays made. These are worn with the whitening agent in them. You wear the trays for anywhere from an hour to overnight for ten days. Results should last 1-2 years, but depending on lifestyle choices, your teeth may darken sooner. You can top up your colour with just a few days/nights of whitening to restore them. This option is generally favoured as you are in control, there is less reported sensitivity and it costs less. 

Is teeth whitening safe? 

Yes, evidence suggests that when carried out with the correct products and with the correct training, teeth whitening is a safe procedure. 

Will it hurt? 

Possibly. Teeth whitening can cause varying sensitivity. This only lasts while you are whitening your teeth and there are products available to help manage such symptoms. 

If you're interested, find out what teeth whitening packages we offer or book an appointment now.