Troubleshooting My Philips Sonicare brush head falls off from my toothbrush handle If your Philips Sonicare brush head falls off from your toothbrush handle, follow our solutions below. Brush head is not attached properly Ensure that the brush head is inserted properly and aligned in the same direction as the front handle. Note: There will be a small gap between the brush head and handle. This is normal. Brush head or handle is dirty Ensure that the bottom of the brush head and the area around the metal shaft is free of debris. You can clean your brush head and metal shaft with lukewarm water or soft cloth. Type of brush heads Are you using brush head that is compatible with your Philips Sonicare tooth brush? Our toothbrushes are only compatible with Philips Sonicare brush heads. Still have questions? Contact our Consumer Care Agents for further assistance or visit our support page.