In Sicily the garlic is considered as cure for all of the present diseases in the modern age. Over there for improvement of their hearing they use the next recipe:
Briefly sauté several cloves of garlic with olive oil. Press each clove of garlic to squeeze the juice inside the cooking oil and proceed it after. Daily put a 3-4 drops of the oil inside your ear and put a piece of cotton on it.
Juice from garlic and onion: It is believed that this juice returns the hearing. The drink is mixture from 30ml garlic juice and 30ml onion juice. You can make different ratio but this one is quite sufficient. Consume it once daily.