There are two main methods of teeth whitening.
In the first, the dentist will make a mould of a patient’s mouth and use it to make a form of mouthguard to fit snugly over their teeth. Then, in the comfort of their own home, the patient fills the guard with the special bleaching gel and wears it for a length of time specified by the dentist over between 2 and 4 weeks.
There are some gels that can be left on for up to 8 hours at a time which means the treatment can be completed in a week.
The other method is laser whitening, also known as power whitening, in which the dentist applies a gel to the patient’s teeth and then shines a light or laser on them to accelerate the whitening process. This is the quicker, more expensive, alternative.