drill connet with
dental handpiece, then let drill twirl. But when drill stop work in mouth,some saliva and blood will inside dental handpiece, it can pass to next person when next person useļ¼, but i remembered dentist did not change dental handpiece for me, only changeed drill. I went back the small clinic, asked dentist, he said did not change dental handpiece for every person, and he told me, all clinics do not change, and told me do not worry, it is safe, very sure.