I've been using Oral-B replacement brush heads on a standard Braun adult electric toothbrush Oral-B handle for years. They fit just right. Very satisfied. These little brushes make it easier for me to access my back teeth. In addition, the brushes are very soft and therefore gentle on my gums. Some reviewers have mentioned blackheads, mold or something else collecting in the brush head. I have never encountered such a problem. In fact, I've never experienced any problems.
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