Update: According to Wiki, Muslims did not "invent" the toothbrush (but they did sacrilize it):
The predecessor of the toothbrush is the chew stick. Chew sticks were twigs with a frayed end used to brush against the teeth, while the other end was used as a toothpick. The earliest chew sticks were discovered in Babylonia in 3500 BC, an Egyptian tomb dating from 3000 BC, and mentioned in Chinese records dating from 1600 BC. The Greeks and Romans used toothpicks to clean their teeth and toothpick-like twigs have been excavated in Qin Dynasty tombs. Chew sticks remain common in Africa; the rural Southern United States - and in the Islamic world the use of chewing stick Miswak is considered a pious action, and has been prescribed to be used before every prayer five times a day. Miswak has been used by Muslims since 7th Century AD.
The first bristle toothbrush, resembling the modern toothbrush, was found in China during the Tang Dynasty (619–907) and used hog bristle...Update: It should come as no surprise that the Jameel Foundation, the exhibit's sponsor, is a Saudi-based racket.
Update: It seems like a good time to reprise my song parody, "Thanks for the Minarets."