Tray 6 is in and the first day hurt like hell. It is a different tooth it seems each time that decides it doesn't like being turned this way or that way. Likewise, by the end of the two week period the tray seems like it is getting more worn and jagged that I can barely wait to put the new ones in; Until they get in then I wish I had the other tray back in. This is day two with this tray and I am already feeling jagged spots. When I pop them out I can't find them so I can't do anything about it.