Compatible with our sonic skin cleansing system to clean areas of the body needing extra care and attention, including the décolleté, hands, arms, elbows and feet. To keep your brush head clean, simply rinse the brush head with soap and warm water. We recommend replacing your Clarisonic brush head every 3-4 months. To remove the brush head, grip firmly, then push and twist it counter clockwise and pull the head away from the handle. To attach the brush head, push down and twist the head clockwise until it snaps into place. Be sure you hear a tight snap.