Professional whitening is a process where the licensed dentist or dental professional manages your tooth whitening process by helping you decide what level and type of whitening is best for you. For an in-office whitening treatment, the dentist or dental professional will carefully apply the proprietary whitening formula (gel) directly on your teeth and, depending on the system being used, may or may not utilize a light source or a lazer to enhance the whitening power of the peroxide gel.