Hope you've been flossing regularly!
The Dentistry Museum (31 S. Greene St. in Baltimore, home of the first dental school) houses more than 40,000 dental artifacts, including toothbrushes from the 1800s, George Washington's teeth -- turns out they weren't really wooden -- and dental extraction instruments. (Queue up the nightmare fuel!)
You'll also find exhibits such as MouthPower (roleplaying in a dentist chair), the Narwhal (a life-sized 13-foot whale tooth) and the Marvelous Mouth, a hands-on exhibit with models and interactive computer games. The museum also offers traveling exhibits to communities across the country.
The museum is open Wed.-Sat. 10 a.m.-4 p.m., and Sundays 1-4 p.m. Admission is $7 for adults and $3 for kids.
In conclusion: Can we just say we're glad no one brushes with tree branches anymore?