R.M.
Does he have all of his teeth? Mine grinds his teeth right as new ones are coming in. Every single time so far. I guess he can feel that the teeth are shifting or something. Mine is now just missing his 2 yr molars and they aren't popping up yet, but every so often his gums get red and inflamed and he grinds. I wouldn't worry, but just mention it at your next dentist appt.