Dentistry is the "evaluation, diagnosis, prevention and/or treatment (nonsurgical, surgical or related procedures) of diseases, disorders and/or conditions of the oral cavity, maxillofacial area and/or the adjacent and associated structures and their impact on the human body". Those in the practice of dentistry are known as dentists. Other people aiding in oral health service include dental assistants, dental hygienists, dental technicians, and dental therapists.

A dentist is a healthcare professional qualified to practice dentistry after graduating with a degree of either Doctor of Dental Surgery (DDS), Doctor of Dental Medicine (DMD), Bachelor of Dentistry (BDent), Bachelor of Dental Science (BDSc), or Bachelor of Dental Surgery/Chirurgiae (BDS) or (BChD) or equivalent. In most western countries, to become a qualified dentist one must usually complete at least 4 years of postgraduate study. Generally, 2 years of clinical experience working with patients in an educational setting are required.

Dentists can (and often do) further their training in one or more speciality areas (such as surgery, endodontics, orthodontics, etc.) Hence, there can be a great deal of variation between the level of skill in different disciplines from dentist to dentist, however all dentists must achieve a certain degree of skill in various disciplines in order to graduate from dental school and earn licensure. General practitioners, unlike specialists, have the luxury of choosing which services they will provide and which they will refer to specialists. It is important to note that most general practitioners perform restorative, prosthetic, routine endodontic therapy, routine periodontal therapy, and simple exodontia, as well as performing examinations. Others are comfortable treating more complex cases, as well as placing implants and extracting third molars...among many other procedures frequently referred to specialists. Contrary to popular belief, most dentists do not regularly clean teeth, and instead delegate this task to their support staff (e.g. dental hygienists).