I have bought over 20 of these brushes in the last 2 years. I don't know if anything has changed in terms of manufacturing, but I've noticed a serious drop in quality over the past few months. One head lasted me 2-3 months, now 2-3 weeks. The bristles on her head begin to break off and she immediately goes bald. I would say you can expect around 6 hours of use per head before it starts shedding and becoming unusable.
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