Replacement toothbrush head refills for the Hismile Electric Toothbrush, featuring a soft bristle for a gentle clean. These replacement toothbrush head refills for the Hismile Purple Electric Toothbrush feature a soft bristle for a gentle clean. Gently pull the existing brush head off and replace it with the new brush head. * Replace the brush head once every 3 months. * Gently pull the brush head off and replace it with a new brush head.