Oral-B Complete Microthin Clean toothbrushes feature microthin bristles designed to reach and clean between teeth for a thorough and effective clean. The multi-height bristles fit the contours of your teeth to clean their surface, and the soft tongue cleaner helps remove odor-causing bacteria. These toothbrushes provide a gentle and thorough cleaning experience for your oral hygiene routine. Brushing thoroughly and regularly, at least twice a day, is essential for maintaining good oral health. Replace your toothbrush every three months or sooner if the bristles are frayed for optimal cleaning performance.