Teeth whitening involves bleaching your teeth to make them lighter. It can’t make your teeth brilliant white, but it can lighten the existing colour by several shades.
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.
If you have your teeth whitened you’ll first need to make 2 to 3 visits to the dental surgery.
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 a few weeks. Some whitening gels can be left on for up to 8 hours at a time, which can shorten the treatment period.
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.
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 carried out in beauty salons by untrained staff or staff without dental qualifications puts your oral health at risk and is also illegal.
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.
Teeth whitening doesn’t work on dentures, crowns, fillings or veneers.
No matter what treatment you use, there’s a chance your gums will be sensitive to the chemicals used in teeth whitening, particularly if you already have sensitive teeth. There’s also a chance of burns to gums and some of the whitening kits used at home can harm tooth enamel.