A full mouth makeover occurs when a dentist performs transformative dental work on a patient in as few appointments as possible. Each patient will be treated on a case-by-case basis, where your dentist will analyze the state of your oral health and creates a treatment plan to reach your smile goals. A full mouth makeover occurs when a dentist performs transformative dental work on a patient in as few appointments as possible. Each patient will be treated on a case-by-case basis, where your dentist will analyze the state of your oral health and creates a treatment plan to reach your smile goals.