Bests & Worsts Reviews from Amazon

Mold began to form on the inside of these brush heads and chunks of this mold would break off into my children's mouths while they brushed. We had only been using them for 3 weeks when we began to see mold. I put the brush heads in the dishwasher to clean them out, but they continued to shed chunks of mold after each use. We put on brand new brush heads and took care to take off the heads, rinse the heads, and set them to dry after each use. A month later, more mold. After my child spit black one night I threw in the towel. There's clearly a design flaw here.