It is a personally prepared method under the instruction of the dentist. After the mouth measurements are taken from the patient, rubber molds are prepared. A gel with a whitening feature is squeezed into these molds. Patients are asked to wear this mold for 6-8 hours, preferably at bedtime. It may take 1 week-10 days, or it can be extended up to 4 weeks. This period is adjusted according to the color tone required.