Hi there, Thank you for sharing this feedback with us. We're sorry to hear that you're facing an issue with your Philips Sonicare ProtectiveClean 6100. This is not the experience we wish you had. However, we suggest you try these suggestions to see if you can fix the issue. Sonicare toothbrushes use powerful vibrations to clean your teeth. The sound produced is louder than a manual toothbrush. It may take some time to become acquainted with electric brushing if you are new to it. A loose brush head could be the cause of your toothbrush's unusually loud noise. Ensure that the brush head is firmly attached to the handle. A small gap will remain between the handle and the brush head for vibration as needed. It's best to get your brush head replaced every three months. If you're looking for a new brush head, you can find it in our online store. Take off the brush head from the handle. Turn your toothbrush on. If your toothbrush is still making a loud and abnormal noise your toothbrush is broken. We recommend you request an online repair or exchange. If your brush head stops making noise, it is defective or worn out. A new brush head must be replaced. We hope this information was helpful. If the issue still persists, please get in touch via Social Media. We’re available on Facebook (@Philips) and Twitter (@PhilipsCare). Don’t worry, if you don’t use Social Media, you can also reach out to us via the contact page: www.Philips.com/contact. Hope to speak to you soon! Best regards, Philips Consumer Care