Healthy undamaged cilia in the cochlea of the ear.
This physical damage is permanent and irreversible. So protect what you have if you want to keep it.
NRA Life Member - Orange Gunsite Member - NRA Certified Pistol Instructor
"When plunder becomes a way of life for a group of men living together in society,
they create for themselves in the course of time a legal system that authorizes it and a moral code that justifies it." Frederic Bastiat