Search: why do teeth chatter
Why: It was like 53° last night outside the hot tub.
Answer: To keep your face warm!
Your body usually maintains a constant temperature of 98.6 degrees F; that's the temperature the cells of the body work best. So your body will do anything it can to get back to that peaceful place. If there's any significant change in temperature, it's sensed by the area of the brain called the hypothalamus.Source: Ask Dr. Oz
When the body gets too cold, this center alerts the rest of the body to begin warming up. Shivering, the rapid movement of the muscles to generate heat, begins. Teeth chattering is simply localized shivering.
The More You Know: Were these ever funny?