Professionally Dispensed Take Home Whitening Kits Verses, Over-The-Counter Teeth Whitening

Many dentists believe that professionally dispensed take-home-whitening kits give the best results long term. Patients leave with a peroxide gel that remains on the teeth for an hour or longer. The gel is applied to the teeth using custom-made bleaching trays resembling mouth guards.
Over-the-counter teeth whitening options are the cheapest, the bleaching gel concentration is lower than the professional take home whiteners.
The gel is applied with a one-size-fits-all tray, whitening strips, or paint-on applications. In many cases it may only whiten the front teeth while custom trays whiten the entire smile.