Replacement Head carefully designed to provide optimum cleaning for all mouth types, using individually rounded bristles cut to cup and gently clean each tooth.Rinse your Sonic+ Brush Head before the first use and after each use. Dentists recommend you replace your brush head every two to three months, however, itu0027s best to replace it when the bristles start to become frayed.- High-quality bristles- Silicone polishing element- Individually rounded bristles for a gentle yet effective clean- Simple click push fit