Cervical abrasion / abfraction-type lesions on facial surfaces of premolars and canines.

Treatment for non-carious cervical lesions and dentin sensitivity follows a "least invasive first" philosophy. When the lesion is shallow, not actively carious, and causing only sensitivity, desensitizing agents such as topical fluoride varnish, potassium nitrate, or calcium phosphate pastes are the most conservative option because they do not remove any tooth structure. Composite fillings (A) and GI (D) require mechanical preparation and removal of tooth structure. SDF (C) is used for arresting active caries, not for managing sensitivity on a non-carious abrasion. Therefore, repeated fluoride varnish applications are correct.