Some very old hearing aids have a long vent that runs through them entirely. Vents like this are not common on modern hearing aids. Change the EartipsPhotograph: Chris NullEventually, eartips will wear out or break, especially if you remove them frequently to clean your hearing aids, or they will just become too filthy to clean effectively. Third-party eartips are available for many model hearing aids, but quality will vary considerably. And remember to always keep your hearing aids stored in their case (never a pocket) when not in use.