Head: rounded and small size for easy brushing and access to remote areas. Filaments: 1,400 Tynex filaments arranged into 41 strands. This large number of filaments increases the strength, effectiveness and durability of the brush. They have rounded corners and textured to avoid damaging the tooth enamel or gums. Neck: new thinner and elongated for better access to remote areas neck. Handle: smooth to prevent accumulation of germs. Zone grip prevents slipping during brushing. Protective cap: transparent keeps brush isolated from external contamination and the bristles together. It has an inlet guide strands to dry without touching the wall and prevent the growth of bacteria, thus prolonging the life of the brush. Colors: 6 colors to choose.