Designed especially for sensitive teeth and gums, Philips Sonicare Sensitive Standard toothbrush heads feature extra-soft bristles that gently brush away plaque for a thorough clean with less inflammation. The Sonicare Sensitive brush heads snap on and off for easy cleaning and have reminder bristles that fade to let you know when it"s time for replacement. For ideal results, a new brush head is recommended every three months. Soft Bristles for Sensitive Teeth and Gums Perfect for those with sensitive teeth and gums, Sonicare Sensitive Standard brush head bristles are extra soft--20% softer than Sonicare"s ProResults Standard brush heads--for comfortable yet effective cleaning. Gentle Cleaning with Plaque Removal These brush heads remove plaque deep between teeth and along the gum line to improve gum health. Designed with ultra-soft bristles, they also gently clean along the gum line, removing plaque while stimulating gums. Replace Every Three Months You can"t see it, but your brush head wears over time. Blue reminder bristles fade in color to let you know when it"s time to replace the brush head. Dental professionals recommend replacing your brush head every three months. Use with Multiple Sonicare Handles The Sensitive Standard brush head works with the following Sonicare models: DiamondClean, FlexCare+, FlexCare, HealthyWhite, and EasyClean. The brush heads snap onto Sonicare handles for easy replacement and optimal hygiene.