Using earplugs can cause earwax to be pushed into the middle ear while the earplug is inserted into the ear canal, which can cause tinnitus, reduced hearing, pain, or bacterial infection. Users with excess earwax should use earplugs more carefully, and earplugs should be cleaned frequently with water and mild soap. However, foam-type earplugs are usually disposable and may lose their slow rebound properties when soaked in water and dried. In addition, noise-canceling earplugs may also be a trigger for otitis because many bacteria thrive in warm, humid environments. However, using noise-blocking earplugs is generally safe, but you must be aware of some potential dangers that may arise with long-term use: Inserting the earplugs can cause the air pressure in the middle ear to rise and push against the ear drum, causing pain. This is because the earplugs are inserted too far.