Twooth? Timer is the award-winning, mom-invented tooth brushing timer to help children & adults brush their teeth for the recommended two minutes. Tooth decay is the most common, chronic childhood disease and it is preventable! Good dental hygiene is a major factor in the prevention of tooth decay. Using Twooth? Timer makes brushing fun, helps improve dental hygiene which lowers dental bills, and reduces stress for parents/teachers! Because even small children can do it themselves, they take more responsibility for their dental hygiene and feel a sense of accomplishment when they brush their teeth for the full two minutes. More brushing & less fussing! It's so simple to use, even for a toddler. Simply turn the top clockwise to the 2 and brush till the bell rings. Conveniently sized to fit on counter tops (without taking up much room), in most medicine cabinets and drawers: 3 ?"H x 2 ?"W x 2 ?"D. No batteries needed!