Sonic Rechargeable Electric Toothbrush with Genuine 7AM2M Sonic Optimal Plaque Control replacement toothbrush heads.Compatible with 7AM2M AM100/AM105C/AM111. Fading Reminder Bristles - Indicates replacing of brush head when the blue color bristles fade away.Usually, we recommend you replace it every 3 months at least. "W" shape design to suit teeth topography for thorough cleaning of gums and hard to reach areas. Our replacement brush contoured pattern adapt to the shape of your teeth and gums, covers more tooth surface, enhancing the sonic cleaning power for deeper cleaning in hard-to-reach areas. Sonic Rechargeable Electric Toothbrush with Genuine 7AM2M Sonic Optimal Plaque Control replacement toothbrush heads.Compatible with 7AM2M AM100/AM105C/AM111.