Your ear produces an oily, waxy substance called Cerumen, otherwise known as earwax. An overproduction of earwax or a build up of debris in the ear canal can lead to a reduction in hearing or a feeling of dull hearing.
Earwax gets little credit for all the good it does for your health and well-being. It has two primary purposes, to protect your ear from dust and other foreign particles that might otherwise get trapped inside your ear and to lubricate your ear canal to stop the skin from becoming dry and itchy.
An excess of earwax can sometimes cause a build-up or blockage and affect your hearing.