What defines Class II Decay?

Class II decay specifically refers to carious lesions that develop on the proximal surfaces of molars and premolars, which are the teeth located at the back of the mouth. This classification is part of the international caries classification system used to categorize dental caries based on location and severity.

The reason this classification is important is that proximal surfaces are more susceptible to decay due to their location, making it harder to clean effectively with a toothbrush. Recognizing Class II decay allows dental professionals to identify and treat these cavities, helping to prevent further decay and the potential need for more invasive procedures in the future.

The other options highlight different types of decay classifications. Pits and fissures of incisors refer to Class I decay, while smooth surfaces of canines are associated with Class III decay, and decay only on the incisal edge could involve Class IV decay. Each type of decay corresponds to specific tooth areas that require distinct approaches for prevention and treatment.