George Washington's Teeth

According to Wikipedia;

…[Washington] had several sets of false teeth made, four of them by a dentist named John Greenwood. Contrary to popular belief, none of the sets were made from wood. The set made when he became President was carved from hippopotamus and elephant ivory, held together with gold springs. The hippo ivory was used for the plate, into which real human teeth and bits of horses' and donkeys' teeth were inserted. Dental problems left Washington in constant pain, for which he took laudanum. This distress may be apparent in many of the portraits painted while he was still in office, including the one still used on the $1 bill.