I HAD THEM PUT ON LAST YEAR THEN MOVED TO MINNESOTA AFTER SEVERAL MONTHS DR DRINKWATER TOLD ME TO CHECK BACK IN A YEAR. AFTER ABOUT 6 MONTHS I HAD A DENTIST IN MINNESOTA CHECK MY TEETH AND HE SAID MY FRONT TEETH WERE LOOSE AND TO STOP THE INVISALIGN ASAP. HE SAID HE COULDN'T BELIEVE THAT DRINKWATER DIDN'T TELL ME TO GO TO A DENTIST IN MINNESOTA THAT YOU HAVE TO BE MONITORED ON A MONTHLY BASIS FOR FIT TO MAKE SURE YOUR NOT GOING TO FAST SO THAT YOUR FRONT TEETH CAN ADAPT. THIS DID NOT HAPPEN. NOW I'M OUT 5K AND MY FRONT TEETH ARE LOOSE.