(OT - sort of) See my response to Train Guy - I guess I was vague in that I was quoting what I consider a reliable source who is a dentist. Sorry for any confusion. I also might comment that there are now 2000 dentists with the waterlase laser from BLTI, so word is starting to get out. There are 5 dentists in my area, up from 2 about 4 months ago. If you want to find a Waterlase dentist go to Biolase's web site - they have a "Find a Dentist" button where you put in zip code or city.