RETAIN is a retainer replacement solution. You can create an account for free and have new retainers delivered right to your door—no need to book an appointment or come into the office (unless a new scan is needed). The frequency option will send you a new set of retainers based on your preferred frequency (every 1, 3, 6, or 12 months). You can skip orders, change frequency, or change the date of your next order at any time.The on-demand option lets you order a replacement only when you need one. This is great if you don't want regular shipments, but want easy access to order when something happens.