Jack n' Jill buzzy brush replacement heads for buzzy brush electric toothbrush. It has soft DuPont nylon bristles and very gentle rotary action. Dentists recommend that these toothbrush heads be replaced every 3 months or sooner. Compatible only with the new buzzy brush electric toothbrush.Compatible only with the new buzzy brush electric toothbrushSoft DuPont nylon bristlesRotary design soft vibrationsOnly to be used under adult supervision