Mold will form if you don't separate the head from the handle after each use. But mold grows the most on the head of the toothbrush, where the two parts meet. Be careful. We need to find a way to dry the inside of the toothbrush head. And it happens in less than 2 months. I've had them since February I believe and even bought replacement heads when I bought my toothbrush. But with this mold problem I wouldn't buy it again.
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