Because you should be replacing your toothbrush every three months, it's important to build up a stockpile of brushes when you find Oral-B sales, promotions, or coupon codes. Going out and buying a new brush (or brush head) every time you need a replacement can not only take up a lot of time, but you'll most likely end up spending a lot more in the process too. Now, whether you prefer manual toothbrushes or electric doesn't really matter. When you find a sale on your favorite brush or brush heads, just make sure to buy extra. The brushes never expire and they're easy to store so nothing can really go wrong. It's also worthwhile to stock up on Oral-B floss when you get the chance since floss never really expires either. To figure out when is a good time to stock up, view our stock up guide below!