Place your index finger inside the toothbrush. Place a small amount of dog toothpaste, sold separately, on bristles of the toothbrush. Pull back your dog's cheek and begin brushing teeth and gums using a small circular motion. No rinsing is required. To clean toothbrush, simply rinse with warm water and let air dry. THIS ITEM IS NOT SUITABLE FOR CHILDREN. Keep out of children's reach. This product is not a toy. It is intended for pets only--not for human use. Please use with care--follow directions closely. If any injuries occur, please contact physician immediately. Do not leave your pet unattended with this tool. Inspect product on a regular basis and discard if any part becomes loose or detached.