Toothbrush Heads with any design on the back of the brush head causing a crack in the material, allowing moisture to penetrate the interior of the brush head and leading to moisture build-up and mold growth at the base of the bristles. I tried different brands and came to the conclusion that this is bad design. My heads, which are non-porous at the back, have no problems. Brush heads are non-refundable, so buyer should be careful. If you are looking for baby attachments, buy a soft/sensitive adult attachment. They also have smaller heads.
Soocas X5 sonic toothbrush, RU, pink
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