we had a bad experience. Our daughter's teeth looked fine right after treatment but now after just 3 years of fastidiously wearing her retainer, the upper front teeth have started to move. His response is essentially that he "never promised a perfect result"--but she had mild overbite and spaces, and no one, including him,said it couldnt be fixed. now ,at age 19, we are bringing her elsewheer to try and fix the problem.