wellness hp10tx replacement heads for hp-stx sonic electric toothbrush (10 pack) wellness oral care these wellness brush heads fit the natural shape of your teeth for a thorough clean. the brush heads feature reminder bristles that fade when replacement is needed. for best results use only wellness healthpro brush heads. wellness recommends replacing your brush head every 3 months for optimal results. these brush heads fit hp-stx sonic toothbrush. may fit other similar brands..