The airflow and water passage 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. Hard Bristles The medium bristles with uniformly rounded tips for maximum respect of enamel and gums. Compact and Non-Slip The compact head makes it easy to reach the molars and performs an effective and complete anti-plaque action. Ergonomic yet linear handle designed for easy and correct use of the toothbrush. Product sterilized during the packaging phase.