I think it is because historically dentistry developed as a separate discipline from medicine. 
Worth noting though that historically surgery was also a different discipline to medicine, being the trade of the barber/surgeon, whereas doctors were mostly university graduates. As more was learned about the body from about the sixteenth century, doctors began to take up surgery, and although there were numerous 'demarcation disputes', it became clear by the nineteenth century that medical training was a necessity for surgery, and in most countries, by the end of the nineteenth century a medical degree had become a prerequisite to practice surgery.
Dentistry remained a trade, with entry via apprenticeship far later (my childhood dentist entered the profession via an apprenticeship), and because dentists were not in the same class as doctors, doctors have mostly shown little interest in moving into dentistry. Even as increased medical knowledge led to both more procedures that dentists could do, this required more education, and dentistry mostly required a degree course by WW2 - a separate degree from medicine.
Because the two professions are separate, and possibly because few people die directly from dental problems, this led to dentistry not being included in Medicare. Perhaps the doctors had better lobbyists - the prospect of an early demise is a more powerful driver than toothache!
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
Bookmarks