I already gave my thoughts. Change the bristles on the brush head!!
Response from waterpik.comBy WaterPik, Product Support, March 21, 2022
Hello there - We are sorry to hear that you were not happy with the product. The toothbrush bristles are rated as standard soft and have been proven to be effective. We do offer a 60-day money-back guarantee with this model. If you need assistance, please let us know. You can email us directly at smreviews@waterpik.com or call 1-800-525-2774 for assistance.