The interdental filaments on Wisdom Control Grip provide a thorough clean for teeth and gums. Whilst the angled neck provides easy access to back teeth.Interdental filaments for effective cleaning of tooth surfaces, between the teeth and along the gum line_x000D_ Angled neck to help provide easy access to all areas of the mouth including the back teeth_x000D_ Easy grip handle to improve comfort and control whilst brushingDentists & hygienists recommend you change your toothbrush every 3 months.