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Earplug
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===Long-term use=== Custom shaped plugs are recommended for long-term use, since they are more comfortable and gentle to the skin and will not go too far into the ear canal. Nevertheless, prolonged or frequently repeated use of earplugs has the following health risks, in addition to the short-term health risks: *They may cause [[earwax]] to build up and plug the [[outer ear]], since it blocks the normal flow of earwax outwards.<ref name="NHSearwax">[http://www.nhs.uk/conditions/earwax/Pages/Introduction.aspx NHS Ear Wax Build-up] - Ear plugs</ref> This can result in tinnitus, hearing loss, discharge, pain or infection.<ref name="NHSearwax" /> Excess earwax should be carefully [[Earwax#Removal|removed from the ear]], and earplugs should be cleaned regularly with water and mild soap. However, foam type earplugs are usually designed to be disposable, and will expand and lose their memory property upon drying after washing with water and soap. From then on, they will expand very quickly after being compressed, making proper insertion into the ear canal quite problematic. They also lose a large proportion of sound attenuating capability after such washing and drying. *They may cause irritation of the [[temporomandibular joint]], which is located very close to the ear canal, causing pain. Individually fitted non-elastic earplugs may be less likely to cause this irritation compared with foam ones that expand inside the ear canal. *Earplugs are also a possible cause of ear inflammation ([[otitis externa]]), although the short-term use of earplugs when swimming and shampooing hair may actually help prevent it. Still, many [[pathogenic bacteria]] grow well on warm, moist, foam-type plugs (polyvinylchloride (PVC) or polyurethane). However, there need also be a loss of integrity of the skin for infection to occur. Hard and poorly fitting earplugs can scratch the skin of the ear canal and set off an episode. When earplugs are used during an acute episode, disposable plugs are recommended, or used plugs must be cleaned and dried properly to avoid contaminating the healing ear canal with infected discharge.
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