Wearing the trays once every 2 months will keep your teeth at a very stable colour indefinitely, however if you want to keep them at an even brighter white, you may want to wear the trays once a month.

How often teeth whitening treatments are recommended by dentists. Professional teeth whitening performed in the dentist's office is recommended once every year to every 18 months, depending on how long the results last. At-home kits can be used as often as once every four to six months.

How long does LED teeth whitening last? In general, LED teeth whitening is better than the average over-the-counter product, especially when performed by a well-trained dentist. The process itself is quick and takes about 20 minutes. The results of it, however, can last you for several months.

If you opt for an at-home teeth whitening kit, you can generally expect your results to last for about four to six months with touch-ups as needed. However, if you choose to get your teeth professionally whitened at the dentist's office, your results could last up to a year or even longer with proper care.