The action of air and water passing through the 6 holes oxygenates the bristles, making the OXIGEN toothbrush much more hygienic compared to traditional toothbrushes. The presence of the holes also shortens the drying time of the bristles, reducing the possibility of bacterial formation. Medium Bristles The medium bristles have uniformly rounded tips for maximum protection of enamel and gums. Compact and Non-Slip The compact head makes it easy to reach the molars and provides effective and complete anti-plaque action. The ergonomic yet linear handle is designed for easy and correct use of the toothbrush. Product sterilized during the packaging phase.