A dentist is a person who is qualified to examine and treat people's teeth.
Visit your dentist twice a year for a check-up.
The dentist or the dentist's is used to refer to the surgery or clinic where a dentist works.
It's worse than being at the dentist's.
dentist in British English
(ˈdɛntɪst)
noun
a person qualified to practise dentistry
Word origin
C18: from French dentiste, from dent tooth
dentist in American English
(ˈdɛntɪst)
noun
a person whose profession is the care of teeth and the surrounding soft tissues, including the prevention and elimination of decay, the replacement of missing teeth with artificial ones, the correction of malocclusion, etc.