If you use them with standard toothpaste they break down pretty quickly. I always use gel toothpaste, it lasts a long time and does a really good job of keeping my teeth clean and gums healthy. A battery-powered pen typically lasts at least a year or more. I just think that the dual action on these brushes is preferable to many other brushes that only give you a circular action. I received good service from this carrier.
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