There are two types of teeth whitening. In office, or take- home whitening. Both whitening ways must be done and followed up by a professional dentist. The ADA recommends having the teeth checked by a dentist before undergoing any whitening method. In our office, we examine the patient thoroughly taking health and dental history by observing hard and soft tissues. Treatment times and recommendations are dependent on the condition of a person’s teeth and overall health issues like sensitivity and allergy to hydrogen carbamide.