noun

• (uncountable) The field of medicine concerned with the study, diagnosis, and treatment of conditions of the teeth and oral cavity.
• (uncountable) Operations performed on teeth and adjoining areas such as drilling, filling cavities, and placing crowns and bridges.
• (countable) A dental surgery, an operation on the teeth.
• (countable) A place where dental operations are performed. (Not as common as "dentist's office". Compare surgery.)