The dentistry task, for those wondering, was all an attempt to frighten the racers. They filled out a real-looking medical questionnaire, sat down in the dentist chairs with the (possibly fake) teeth and blood next to them, watched as the very stoic nurse and dentist came in and put down scary looking tools, and had the dentists put tissues and gel in their mouths. After stewing in their nerves for a few minutes, the dentist came back out laughing and presented teams with a fake gold tooth (which they could wear over one of their real ones) and their next clue.
Shani had the best reaction, I think.