question: The two most common locations for supragingival calculus to develop are the?
opa: Lingual surfaces of the maxillary molars and the buccal surfaces of the mandibular anterior teeth
opb: Buccal surfaces of the maxillary molars and the lingual surfaces of the mandibular anterior teeth
opc: Buccal surfaces of the mandibular molars and the lingual surfaces of the maxillary anterior teeth
opd: Buccal surfaces of the maxillary anterior and the lingual surfaces of the mandibular posterior teeth