I had Braces 10 years ago and continued to wear retainers to keep my teeth straight. About two years ago my top retainer broke and my orthodontist was no longer at his practice. I went to an orthodontist and was told that the Invisalign treatment would be $5,200. The assistant even asked why I needed Invisalign because my teeth looked pretty good (I have one tooth that is really relapsing). I was told that the cost for Invisalign was a flat rate not per case, is this standard practice?