Using too much hydrogen peroxide can irritate the skin inside the ear, leading to inflammation and earaches. People should avoid using ear drops if they have an ear infection or a damaged eardrum.

Don't try this at home if you have a history of ear infections Dr. Joorabchi also warned against using hydrogen peroxide to clean your ears if you have a history of ear injury or infection.

Earwax buildup in dogs can lead to health issues, such as itchiness and ear infections ... Riney Canine Health Center. Never use hydrogen peroxide as an ear cleanser since it can irritate healthy ...