Introducing the world's first silicone sonic toothbrush and largest oral care advancement in 70 years, ISSA 3 cleans it all - teeth, gums, cheeks and tongue Featuring medical-grade silicone and PBT bristles, it’s tough on plaque yet non-abrasive on gums - so sensitivity and receding gum lines are a thing of the past Improved Hybrid Wave brush head with 2x stronger bounce-back bristles 10,000x more hygienic than nylon silicone plus PBT Polymer bristles 16 speeds of Sonic Pulse technology for a completely customized brush Clinically proven to improve overall oral hygiene by 140% Clinically proven to remove 30% more plaque than a manual toothbrush Prevents gum recession and damage to tooth enamel Up to 365 days of brushing on a single charge 2-year limited warranty