Full mouth debridement is performed when there is significant plaque and tartar buildup that prevents an accurate dental examination. This procedure is often necessary for patients who have not had regular dental cleanings and require a more intensive approach. The goal of full mouth debridement is to remove the dense plaque and tartar deposits, allowing the dentist to conduct a comprehensive examination of the teeth and gums. Once the buildup is cleared, the dentist can diagnose any underlying issues and proceed with appropriate treatment.