Earwax (cerumen) is a natural product of the ear canal that serves many important functions, primarily to protect the ear from external dirt and contaminants. Normally, wax finds its own way out of your ear canal and into the ear opening and is washed away easily. Yet when your glands produce more wax than required, they may naturally become hard and block your ear. As it builds up in the ear canal, the wax prevents the transmission of sound through the ear. In more severe cases, earwax buildup that isn’t removed can cause earaches or even lead to infection.