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Hello! I have reviewed the product details for the Philips Sonicare toothbrush head, model HX4001/20 compatible with the Sonicare Advance 4000 series. This document specifies that the brush head should be replaced every six months to maintain optimal cleaning performance. I'm ready to answer any questions you might have about this product.
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What is the recommended replacement frequency for the toothbrush head?
Which Sonicare toothbrush series is this brush head compatible with?
