Though EZ smile retainers are easy to use and not too pricey, I was a little dissapointed with my results. The way the retainers are anchored, needs improvement. I voiced my doubts when I first started treatment (as my retainers did not cover one of my back molars) but was told this would not affect treatment. I was proved right in due course when the gap between the uncovered molar and the last covered one soon became bigger (a constant nuisance now as food gets stuck in it all the time), and though my teeth appear visually straighter from some angles, they are not level, so my teeth don't sit comfortably without wearing the retainers.