Lasers have been used in dentistry since 1994 to treat a number of dental problems. Yet, despite FDA approval, no laser system has received the American Dental Association's (ADA) Seal of Acceptance. That seal assures dentists that the product or device meets ADA standards of safety and efficacy, among other things. The ADA, however, states that it is cautiously optimistic about the role of laser technology in the field of dentistry. These lasers are different from the cold lasers used in phototherapy for the relief of headaches, pain, and inflammation.
The main reason the ADA has not endorsed a laser system is their belief it is 10 times expensive to perform procedures with it than with the tired and true procedures of the last 50 years. They cite the lack of independent studies to determine improved outcomes or enhanced speed. You'll note Biolase has abandon the broad "painless dentristry" claims.