Short answer: Dental plans commonly pay 100% for preventive care (cleanings, exams), 80% for basic services (fillings), and 50% for major services (crowns, dentures), up to an annual maximum.
Most dental plans use a familiar 100/80/50 structure: preventive care like cleanings and exams is covered at or near 100%, basic services such as fillings around 80%, and major services like crowns, bridges, and dentures around 50%; all subject to an annual benefit maximum. Orthodontia, when included, usually has a separate lifetime maximum. The exact percentages and how a plan classifies services (basic vs. major) vary, so check the schedule of benefits.