Features:

• Extra-soft bristles provides gentle yet thorough cleaning
• Indicator® bristles fade halfway to signal when to replace your brush head
• Extra gentle on teeth and gums
• Indicator bristles' color fades to signal when brush head needs replacement
• Brush heads have removable color-code rings

Editor Reviews:

Product Description:
Oral-B Sensitive replacement electric toothbrush head provides a gentle brushing experience ideal for sensitive teeth and gums.

Amazon.com Review:
The three replacement brush heads in this pack fit all Braun Oral-B electric toothbrushes. They have soft, rounded bristles in the center to protect the teeth from too-firm brushing. Long interdental tips on the edges clean deep between teeth and below the gum line and fade after prolonged use, indicating when a brush head needs replacing. The necks of the brush heads have removable color-code rings to identify individual brush heads for family members. --Fred Brack

Rating : - Soft Bristles!
The bristles are super soft, which is awesome. I worry less about gingival recession or enamel erosion now.