There are two types of teeth whitening systems in dentistry: in-chair whitening and at-home whitening. Generally, we recommend at-home whitening because:
Less sensitivity and other complications.
More stable result.
Cheaper when you top up the whitening.
The advantage of in-chair whitening is the quick result. It only needs a one-hour visit, while at-home whitening takes two weeks.
Even though we recommend at-home whitening, both whitening systems can achieve good result, like this in-chair whitening case.