According to the myth, what were George Washington's teeth made of?

One of the most enduring myths about George Washington is that his dentures were made of wood. It’s quite possible that some of his dentures, particularly after they had been stained, took on a wooden complexion, but wood was never used in the construction of any of his dental fittings. Throughout his life, Washington employed numerous full and partial dentures that were constructed of materials including human, and probably cow and horse teeth, ivory (possibly elephant), lead-tin alloy, copper alloy (possibly brass), and silver alloy.

Source: Mount Vernon