Shred is what I used when destroying a bunch of old drives.

Then I disassbled them to pull out the magnets and platters (because they're shiny and cool). A couple had torx screws that I didn't have the right end for so I ran a hdd magnet over the surface and scratched them with a screwdriver.

For dental pain I recommend ibuprofen (advil). Seems to work significantly better than acetaminophen (Tylenol) and seems to be much safer.