We don't want to lock you in a plan. A box that comes every month is a timely reminder for you to change your brushettes. You might remember your last dentist appointment but you won't remember your last heads bought at a retail store. Once you figure out your own pattern of functions/quantity it's so much easier to get them on a regular basis than having to remember to shop for them. A subscription is de facto healthier for your teeth, even if you only need 1 brushette and only change it once a month and only want to pay $1, at least your next package will remind you to toss that dirty brushette away.