Every day our ears are exposed to loud noises that threaten the health of our hearing system, such simple things as the use of earphones, traffic noise or the garbage truck in front of us represent a risk.

The intensity of sounds is measured in decibels, the human ear has a tolerance of 60 to 70 decibels, the noise of a vacuum is located within this range. When our ears are exposed for a long time to values above the tolerance level, the auditory system is susceptible to permanent damage. A concert, or music in a disco may exceed 110 decibels, after 130 it could cause a total loss of hearing.

The ear is divided into three parts, the outer ear, conformed by the auricle and the ear canal; the middle ear constituted by a chain of three small bones (ossicles) - hammer, anvil and stirrup, finally the inner ear, formed by the semicircular canals, the vestibular nerve, and the cochlea responsible for transmitting sound through the auditory nerve to the brain..

Hearing loss is caused by the destruction of the cells and nerves of the cochlea in the inner ear, once these nerves are damaged the loss of hearing is irreversible.