A patient presents with wedge-shaped (V-shaped) cervical notches on the facial surfaces, associated with vigorous horizontal toothbrushing. This tooth-wear pattern is:

Correct answer: B. Abrasion

• A. Attrition is tooth-to-tooth wear on occlusal/incisal surfaces.
• B. Correct. Mechanical wear from an external object (toothbrush) producing cervical V-notches is abrasion.
• C. Erosion is chemical/acid dissolution producing smooth, cupped/concave surfaces.
• D. Abfraction is wedge-shaped cervical loss attributed to occlusal flexure, not the brush.