ADA (American Dental Association) Accepted. Curved Handle conforms to your hand for comfort and control. Tapered Head for easy access to back teeth. Easy Grip Handle/Thumb Rest for better control. End-Rounded DuPont Nylon Bristles to help protect tooth enamel and gums. Tek Pro Straight toothbrush is accepted as an effective cleansing device that has been shown to remove plaque and reduce gingivitis when used as directed in a program of good oral hygiene to supplement regular professional care. Council on Scientific Affairs, American Dental Association. Dentists and hygienists recommend replacing your toothbrush every 3 months.