A couple of years back I noticed that a guy working at the 'station' adjacent to mine was using a mouthpiece....like a football mouthpiece. At the time, I thought it seemed odd, if not silly. Well, I recently noticed that during very heavy lifts, especially during leg work, I tend to clench my teeth instead of grunting and groaning like many of the apparently constipated folks in the gym. I was just wondering how common this was...because at this rate, I'll be breaking molars in the near future.
