Two Cavity

Does the dentist always use two drills to drill a cavity?

Every time I get a cavity filled, the dentist uses this drill that whines like crazy, and then a second one which shakes a lot

That depends on the preferences of the dentist, and what type of cavity we’re dealing with. For small, simple ones, i tend to only use the high speed handpiece that has water. For the larger ones, that may go deep to the pulp, i use the slow speed (aka whines like crazy) to help remove decay. The reason for this is because the slow speed doesn’t take away tooth structure quickly; it only takes away decay and soft infected tissue. If we went in with the high speed, we may be removing more tooth structure than needed in such an infected area.

Dental Health : How Does a Dentist Fill a Cavity?