No, of course you don't. You can buy our products as a one off purchase and then order replacement products anytime you need. All our product such as brush heads, interdental brushes and mouthwash can be found HERE
If you have purchased a toothbrush from a dental clinic and are claiming your free starter kit then the checkout process will ask you to select a refill frequency and add a subscription to your account. This can be removed at any time by following the process HERE as you are not tied in to any contact and can cancel at any time.