Oral-B Pro-Expert Bacteria Blast with anti-bacterial bristle protection helps keep bristles cleaner between brushing. It inhibits microbial growth that may affect the bristles for up to 90 days. The bristles do not kill bacteria in the mouth or protect you against disease. Always clean the product thoroughly after use. Bristles contain an antimicrobial to keep them cleaner. Does not kill bacteria in the mouth or protect against disease. About Oral-B Pro-Expert: Oral-B is the world's no1 toothbrush brand which brings to you and your family revolutionary brushing solutions with best in class technology to ensure you and your family get healthier and cleaner mouth. Oral-B Pro-Expert has been clinically proven to remove more plaque than a regular manual toothbrush with its crisscross bristles, which are angled at 15 degree to attack plaque from the right angle. Removes up to 90% of plaque with perfectly angled crisscross bristles and has 35% more flexible bristles suited for your sensitivity needs helps clean hard-to-reach places with power tip bristles is gentle on enamel and gums for sensitivity teeth for complete oral care, it is recommended that you visit your dentist regularly.