What you were taught
George Washington had wooden teeth
What we know now
George Washington never wore wooden dentures. Surviving sets used ivory, human and animal teeth, and metal (including gold springs, brass, and lead alloys), not wood. Staining and browning of ivory from wear and poor cleaning is the most likely origin of the myth. By his 1789 inauguration he had one remaining natural tooth; dentist John Greenwood built an ivory, brass, and gold set for the occasion. In May 1784 his Mount Vernon accounts paid £6 2s to enslaved people for nine teeth on account of dentist Jean Pierre Le Mayeur. That purchase is documented. Historians cannot prove those specific teeth were fitted into Washington's own dentures.
Updated understanding emerged around 2014