Troubleshooting How do I sanitise my Sonicare ProResults brush head? Sanitising your Philips Sonicare ProResults brush head keeps your toothbrush nice and clean. So you can enjoy the freshness of a clean mouth. Step-by-step instructions After brushing, rinse the brush head and shake off excess water. Place your finger in the door recess on the right-hand side of the Sanitiser and pull open the door. Remove the drip tray. Select the appropriate brush head holder. (H1 brush head holder for Sonicare ProResults brush heads, H2 brush head holder for Oral-B FlexiSoft of Oral-B FlossAction brush heads). Attach the left brush head holder (L) to the left side of the centre post until it clicks into place. Note: The brush head holders do not fit when you place the right brush head holder first. Always start with the left brush head holder. Attach the right brush head holder ® to the right side of the centre post until it clicks into place. Place the drive tray back into the Sanitiser. Place the brush heads onto the brush head holders with the bristles pointing towards the UV light bulb.