More and more people are paying for brighter, whiter teeth. But does teeth whitening work and is it safe? Here are the answers to common questions about the treatment.

Who can do teeth whitening?

Teeth whitening is a form of dentistry and should only be carried out by a dentist or another regulated dental professional, such as a dental hygienist or dental therapist, on the prescription of a dentist.

Some beauty salons offer teeth whitening, but this is illegal if there’s no dental professional present, and it may put your oral health at risk.

You can also buy DIY home teeth whitening kits but these may also carry risks.

What happens during teeth whitening?

The dentist will take an impression of your teeth to make a mouthguard and tell you how to use it with a bleaching gel. Then, using your mouthguard at home, you regularly apply the gel for a specified period of time over 2 to 4 weeks. Some whitening gels can be left on for up to 8 hours at a time, which shortens the treatment period to 1 week.

Laser whitening, also known as power whitening, is another type of teeth whitening system that a dentist can provide. A bleaching product is painted onto your teeth and then a light or laser is shone on them to activate the whitening. Laser whitening takes about an hour.

What about home kits and beauty salons for teeth whitening?

Only go to a registered dental professional for teeth whitening because whitening by people who aren’t qualified, for example in beauty salons, is illegal. Home kits also carry risks.

What are the risks of home kits and salon teeth whitening?

Some home kits don’t contain enough whitening product to be effective. Also, if a dental professional isn’t doing the whitening, the mouthguard provided may not fit properly so some of the bleaching gel may leak out onto your gums and into your mouth, causing blistering and sensitivity.

Teeth whitening bought online or carried out in beauty salons by untrained staff or staff without dental qualifications puts your oral health at risk and is also illegal.

How do I find out about getting my teeth whitened?

Your dentist will advise you whether whitening is right for you. It may be that teeth whitening isn’t suitable, for example if you have gum disease or crowns. Please contact me if you have any questions.

Is teeth whitening permanent?

Teeth whitening isn’t permanent. It can last from a few months to up to 3 years – it varies from person to person.

The whitening effect won’t last as long if you smoke or drink red wine, tea or coffee, which can all stain your teeth.

Will teeth whitening work on false teeth?

Teeth whitening doesn’t work on dentures, crowns, fillings or veneers.