I went to dentist clinic which was recently opened, so I was kind of the first costumers to come there. The clinic seemed high class. I did the laser, and the surprise was I didn't change my yellow teeth to white, it was a bit lighter color (2 shades maybe). No one noticed it! The doctor was surprised & told me that it worked amazingly with other patients. So, I payed like 400$ after all. I don't know what's wrong? This was two years ago, and now I'm thinking of doing it again. What do u advice?