Troubleshooting My Philips Sonicare toothbrush makes loud noise The Sonicare device is dynamically balanced to function with a brush head in your mouth. The sound level may vary slightly depending whether a brush head is attached to the handle, or not attached. Counterfeit brush heads may make a lot of noise when used on your Sonicare handle. We recommend you only use genuine Philips Sonicare brush heads with your Sonicare toothbrush. Replace your brush head every 90 days As brush heads wear out, they may start to produce more noise. A noisy handle may indicate it is time to replace your brush head. If you have replaced your brush head, and it has not fixed the issue, test the sound level with no brush head attached. If your Sonicare handle is considerably much nosier with no brush head attached, please contact customer care for further trouble shooting. Play Pause You need Flash to see video. Click here to download it.