Hearing aid dispensers (HADs) are fully qualified professionals who can assess hearing and offer after-care services for hearing devices. Hearing aid dispensers must be certified and licensed in order to use hearing technology. Meanwhile, audiologists can assess and diagnose a larger range of hearing and balance problems. An audiologist may be more helpful for medically relevant therapies such as balance issues, noise-induced hearing loss, and earwax impactions. Both professionals are capable of fitting, adjusting, maintaining, cleaning, and repairing hearing aids.