A professional Teeth Whitening appointment usually begins with a dental examination. The dentist checks the teeth and gums to make sure there are no problems that could affect the treatment. Existing cavities, damaged teeth, or gum disease may need to be treated before whitening. Once the teeth are considered suitable, the dentist explains the procedure and expected results. Depending on the selected method, a whitening gel may be applied to the teeth while the gums are protected. The treatment follows the product instructions and the dentist's professional guidance. Patients may receive aftercare advice to help maintain their results.