People’s teeth used to randomly explode in the 1800s due to bad fillings. Before the advent of mercury amalgam, a wide variety of metals were used to fill cavities. Using two different metals could create an electrochemical cell – effectively turning the whole mouth into a low-volt battery.
In Japan, ‘yaeba’ or crooked teeth in girls is considered cute and attractive, and girls in fact undergo procedures to un-straighten their teeth.
In the American Civil War, soldiers were required to have four opposing front teeth so they could open a gunpowder pouch. Some draftees had their front teeth removed to avoid service.
Lobsters have teeth in their stomach.
Imperfect teeth (yaeba) is commonly considered to be cute in Japan.
Beavers have orange teeth.
Mosquitoes have 47 teeth.
A snail can have about 25,000 teeth.