At least that is what I thought!!! This is at the end of tray 12 (of 24). I went in before we left for Hawaii to get more trays and he says they are moving along great but to be prepared there may be some fine tuning at the end, which means additional trays =( Oh bummer...oh well, if I can do it this long and I can handle a few more, right? I CANNOT wait to get the chip in my front tooth fixed! As soon as I am done with Invisalign he will fix it! YAY!!!!!