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Review title: Planned obsolescence: Avoid
Product review: These brushes work fine, but the total operating cost is high due to planned obsolescence of:(1) expensive brush heads wear out fast, and(2) the little rubber blue-green on/off button wears out after about two years of use, leaving a gaping hole in the device handle, which causes the device to fail if exposed to waterThis is a known quality control issue that Philips chooses not to address.
