CrissCross bristles reach between teeth and stimulate gums. Brush heads fit: Oral-B Sonic Complete; Vitality Sonic. Powered by Braun. Does not fit ProfessionalCare, AdvancePower, CrossAction power. 1. CrissCross bristles effectively remove plaque without irritating gums for a clean healthy smile. 2. Each brush head hygienically sealed for convenient storage. 3. Dentists recommend changing your toothbrush every 3 months. Indicator bristles will fade over time, signaling time to change brush head. Made in Ireland.