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[–][deleted] 3 insightful - 2 fun3 insightful - 1 fun4 insightful - 2 fun -  (0 children)

Yeah, because they're hovering directly over a gaping open mucous membrane. A) they don't want to potentially get any sort of nasty shit that flings off of the teeth during cleaning in their eyes or mouth. B) they don't want to potentially spread something to their patients by breathing right all up in there.