Glide - Deep reach bristles. Crest Deep Clean Sensitivity Features: 1. Extra soft bristles with smooth profile designed to be gentle on teeth and gums. 2. Exclusive Green Glide Bristles: Have interslide technology from Glide Floss; Reach deep between teeth for some of the benefits of flossing while you brush. Change brush every 3-4 months due to normal wear. Made in Germany.