Frequently Asked Questions Is my Philips Sonicare toothbrush waterproof? Yes, your Philips Sonicare toothbrush is waterproof. However, never put your handle in a dishwasher to clean it. Find out more. Waterproof buttons You may notice slight gaps around the buttons on the handle, but do not worry. The Philips Sonicare handle is sealed and waterproof. Note: Don't use sharp instruments to clean the gaps. This may tear up the watertight seal and allow water to enter the handle.