✔️ HSA / FSA Eligible For existing clear aligner customers only.👉 New customers in need of retainers - click here Once you finish with NewSmile™ clear aligners, and have achieved the smile you always wanted, wear your retainers to maintain a lifetime of confidence. Click here for Extra Thick Retainers  Teeth have a tendency to shift back after straightening, and retainers will prevent teeth from being crooked or spaced again. We recommend changing retainers every 6 months (because they will stretch), and to wear your retainer as instructed for life to prevent your teeth from shifting back.