For kids under 7 years old Replacement brush for KISS YOU (Kids) Direct flows of good-for-health negative ions on teeth and gums. Remove plaque - the main cause of caries and periodontal diseases - efficiently. Massage gums with excellent ion action at the same time. Features ●Replaceable brush head. Economical. ●3V battery inclusive (battery life: 1 year) ・3 columns of bristles ・Super small head ・For babies and kids under 7 ・Hardness：Regular ・Color：Clear