a U-shaped Toothbrush, Also Known As A Mouthpiece Toothbrush Or An Auto-brush, Is A Type Of toothbrush That Is Designed To Clean All The Teeth At Once, In Less Time Than Manual Brushing. The U-shaped Silicone Brush Head Fits In Your Child's Mouth Like A Mouth Guard, And Features Soft Bristles That Cover All The Teeth. The Head Is Attached To A Battery-powered Base That Sends Out Sonic Vibrations, Causing The Bristles To Pulse And Clean All Of Your Children's Teeth At Once. Supposedly, Brushing Is Completed In Just Ten To Thirty Seconds With A U-shaped Electric Toothbrush As Opposed To Two Minutes With A Manual Toothbrush. Like A Manual Toothbrush Head Or Aegular Electric Brush Head, U-shaped Brush Heads Should Beeplaced Every Three Months.