According to Dr. Brock Rondeau, it is approximately 1000 times a day.
Source: Rondeau B, The Importance of Diagnosis and Treatment of Patients with TM Dysfunction, The Journal of the Academy of General Dentistry, Sept 2007, pg 8-13.
Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)