Twelve supernovae going off all at once on top of one's teeth.
.
A close second, I would guess (never done it), would be 80 grit sandpaper on a belt sander bearing down on one's teeth.
After that, perhaps not brushing or flossing after meals.
cream soda is the worst
the worst thing they can do is die.
coca cola
cavity
One's you haven't heard of.
The Worst Thing About My Sister was created in 2012.
coke
Strong acids and bases.
No. Their teeth are to small. the worst they can do is nibble you.:)
Regular Coke but diet is still bad for your teeth
THE BEST THING TO DO TO PREVENT BAD TEETH IS BRUSH YOUR TEETH.
The Worst thing about New York is its traffic and congestion.