If you notice an unusually large number of people talking around downtown with little mirrors and dental picks, don't be frightened; the Chicago Dental Society is holding its 139th annual meeting tomorrow, and they're expecting over 30,000 dental professionals to attend from the US and abroad. In addition to the meeting, more than 600 vendors will attend the conference, making it one of the largest exhibits of dental products in North America. The meeting takes place at McCormick Place from 11:00 to 2:00, and there will be public tours of the exhibition floor, just in case you wanted to see the latest in dental technology. Now rinse.