Hakora, kamar sauran sassan jikin mutum, suna ƙarƙashin canje-canje masu dangantaka da shekaru. Don haka, a mafi yawan lokuta, a tsawon shekaru, hakora suna da duhu. Wannan yana faruwa saboda dalilai da yawa. Na farko, saboda thinning na saman Layer na hakori - enamel. Daga mai yawa shafi tare da lokaci, enamel ya juya zuwa wani amintaccen "fim", ta hanyar launin rawaya, launin rawaya ko har ma mai ja dentin yana bayyane.
Abu na biyu, dalilai na waje suna shafar canji a cikin launi na hakora. Waɗannan sun haɗa da jaraba zuwa shayi, kofi, shan sigari kuma bai isa kulawa da hakoran ba. Saboda wannan, hasken wuta mara kyau ya bayyana a farfajiya na hakora. Launin hakora zasu taimaka wajen gyara tsabtataccen kwararru, da fari ko ta amfani da veneers.
A ko ƙarami shekaru na iya ba da shaida ga kananan tsawon hakora da ya rusa lokacin rayuwa. Wannan yana haifar da canji a cikin cizo har ma da m fuskar. Abin farin ciki, likitocin hakora sun koyi yadda ake jiyya ga wannan ta hanyar ƙara hakora ko shigar da tsoffin sojoji.
Rashin wasu hakora kuma suna da murmushi. Yana faruwa ko da hakoran baya. Saboda sarari a cikin hakori, ragowar hakora canza matsayinsu (gigan adon hanji, curvature na hakora na faruwa). Sabili da haka, kuna buƙatar komawa ga masu haƙuri a cikin lokaci.