My son has autism & ruins his toothbrushes a lot by chewing on them while he is brushing his teeth. We used to go through 2 toothbrushes a month until these. It comes in a pack of 4 & we're only on our 2nd after 3 months. I love that they are made from Bamboo so that we don't add more plastic to the world. will be using these from now on.