Teeth whitening

Teeth whitening involves bleaching your teeth to make them a lighter colour. Teeth whitening can’t make your teeth brilliant white, but it can lighten the existing colour by several shades.
Standard teeth whitening involves several visits to the dentist plus sessions at home wearing a mouthguard containing bleaching gel. The whole process takes a couple of months.
A newer procedure called laser whitening or power whitening is done at the dentist's surgery and takes about an hour.
Teeth whitening is cosmetic and therefore generally only available privately.
It is occasionally available on the NHS if you have a clinical need, for example to whiten a tooth that's gone black because the nerve has died.