Waterpik JT100 Classic Jet, 2 pc, Interdental cleaning for Men, The Waterpik JT100 Classic Jet replacement interdental brush replaces your old one, thus guaranteeing perfect oral care. Characteristics: prevents gingivitis and bad breath easy to replace removes dirt from between the teeth perfectly does not irritate and does not damage the teeth or gums How to use: Replace the old brush with the replacement brush.