Maruman Sonic Vibration Toothbrush Pro Sonic MAX Dedicated Replacement Brush Soft DK012 8 sets 16 replacement brushes ● Ultra-fine bristles thoroughly clean between teeth and gums. The ultra-fine bristles enter the periodontal pocket and remove plaque with sonic vibration! ● Easy to replace the brush. The replacement brush should be replaced within 3 months. Replace the brush if the bristles become frayed even within 3 months.