牙医 literally means 'tooth doctor' — 牙 (yá) means 'tooth' and 医 (yī) means 'doctor' or 'physician'. Together, they form a compound noun referring specifically to a dental professional who diagnoses, treats, and prevents oral health issues such as cavities, gum disease, and misaligned teeth. Unlike general physicians (医生), 牙医 focuses exclusively on the mouth, teeth, gums, and related structures.

This term is widely used in everyday Mandarin across mainland China, Taiwan, and other Mandarin-speaking communities. It’s neutral in register — appropriate for formal appointments, casual conversation, and written contexts like clinic signs or insurance forms. While dentists may specialize further (e.g., orthodontists or oral surgeons), 牙医 remains the default, all-purpose term for any licensed dental practitioner.