Before the high speed drills which are loud and high pitched, the electric ones they used "rumbled", which probably did not cause hearing loss and tinnitus. The drill had a foot pedal, which was used by the dentist, to operate it.
I should add that your teeth smoked when they were drilled by this type of device, and children were not given any anesthesia.
I should add that your teeth smoked when they were drilled by this type of device, and children were not given any anesthesia.