Does applying a biosensor hurt? Don't worry, the majority of Abbott CGM users said that applying a biosensor was painless. In a study conducted by Abbott, 91.6 % of users surveyed (n=119) agree that it was painless to apply the biosensor. Data on file at Abbott. Related articles Are biosensors waterproof or water resistant? Can I wear a biosensor if I have hairy arms? How long can I wear a biosensor? What if my biosensor comes off too soon? How do I recycle or dispose of my biosensor?