My teeth appeared only 4 shades whiter for the remainder of the day but seemed to look as they were by the next day. 15 mins under the light is not enough.. did not get the desired results.
so far very good exp therapist is very thorough - have booked a course of 6 sessions
i did give some feedback on the 4% levy and 3% levy on amex and cc
would recommend as therapist is very thorough and does not rush the appointment