Teeth whitening treatment uses a special whitening gel, applied directly to your teeth, to improve their shade.
The gel is placed into a whitening tray, which is bespoke to you and designed to fit over your teeth. Wearing the tray brings your teeth into contact with the whitening gel.
Whitening treatment involves wearing your trays, with gel inside, for a number of weeks. The length of treatment, when you wear your trays, the gel used and how often all depends on your precise treatment.