Cov hniav yog qhov tseem ceeb rau zom thiab nqos cov zaub mov. Canines, incisors, premolars, molars: txhua tus hniav muaj cov haujlwm tshwj xeeb. Txawm hais tias qhov teeb meem ntawm "daj" cov hniav feem ntau yog qhov zoo nkauj, nws tuaj yeem ua rau muaj kev ntxhov siab rau tus neeg uas cuam tshuam thiab ua rau nws nyuaj. Txawm li cas los xij, qhov nyuaj tuaj yeem cuam tshuam kev ntseeg tus kheej, kev sib raug zoo nrog lwm tus, lub peev xwm ntawm kev ntxias ntawm tus kheej thiab nws txoj kev sib raug zoo. Yog li, cov hniav daj: leej twg yog tus ua txhaum?

Lub crown ntawm cov hniav yog tsim los ntawm peb txheej uas enamel thiab dentin yog ib feem. Lub enamel yog qhov pom ntawm cov hniav. Nws yog pob tshab thiab tag nrho mineralized. Nws yog qhov nyuaj tshaj plaws ntawm tib neeg lub cev. Nws tiv thaiv cov hniav los ntawm cov kua qaub thiab cov teebmeem ntawm zom. Dentin yog lub hauv paus txheej ntawm enamel. Nws yog xim av ntau los yog tsawg. Qhov no yog vascularized (= cov hlab ntsha uas muab lub cev).

Qhov ntxoov ntxoo ntawm cov hniav yog txiav txim siab los ntawm cov xim ntawm cov hniav thiab lub thickness ntawm cov enamel.

Yuav tsum nco ntsoov:

Cov enamel hnav tawm dhau sijhawm thiab sib sau ntawm cov khib nyiab ntawm txhua yam. Qhov hnav no ua rau nws tsawg thiab tsawg thiab tuab thiab ntau thiab pob tshab. Qhov ntau pob tshab, qhov pom ntau dua nws cov hauv qab, lub dentin, yog.

Txawm hais tias nws yog sab hauv lossis sab nraud, PasseportSanté tau ua nws qhov kev tshawb fawb los qhia rau koj uas yog lub luag haujlwm rau cov hniav daj.

Thaum hais txog cov hniav dawb, peb tsis yog txhua tus yug los sib npaug. Cov xim ntawm peb cov hniav muaj feem xyuam rau qhov sib piv nrog cov xim ntawm peb cov tawv nqaij los yog peb cov pos hniav. Cov xim ntawm peb cov hniav tuaj yeem txiav txim siab los ntawm cov yam ntxwv ntawm caj ces, tshwj xeeb tshaj yog heredity.

Qhov no tsis yog xov xwm: luam yeeb ua rau muaj kev phom sij rau kev noj qab haus huv feem ntau, thiab rau lub qhov ncauj. Qee yam ntawm cov luam yeeb (tar thiab nicotine) ua rau daj lossis xim dub, uas tuaj yeem pom tias tsis pom zoo. Cov nicotine tawm tsam cov enamel, thaum lub tar yog lub luag hauj lwm rau browning xim ntawm lub dentin. Thaum kawg, txhuam yooj yim yuav tsis txaus los tshem tawm cov pob no. Tsis tas li ntawd, kev haus luam yeeb pab txhawb kev tsim cov tartar uas tuaj yeem ua lub luag haujlwm rau kev tsim cov kab noj hniav.

Dentin yog vascularized ib feem ntawm cov hniav. Los ntawm cov ntshav, noj tshuaj, suav nrog qee yam tshuaj tua kab mob, cuam tshuam rau nws cov xim. Tetracycline, tshuaj tua kab mob dav dav tau sau tseg thaum xyoo 70 thiab 80s rau cov poj niam cev xeeb tub, tau muaj kev cuam tshuam rau cov xim ntawm cov hniav hauv cov menyuam yaus. Cov tshuaj tua kab mob no tau muab rau cov menyuam yaus tau muaj feem cuam tshuam rau cov xim ntawm lawv cov hniav mus tas li. Cov xim tuaj yeem sib txawv ntawm daj mus rau xim av lossis txawm grey.

Fluoride ntxiv dag zog rau cov hniav enamel. Nws pab kom muaj cov hniav muaj zog thiab tiv taus cov kab noj hniav ntau dua. Kev siv tshuaj fluoride ntau dhau ua rau muaj fluorosis. Qhov no yog qhov tsim ntawm stains ntawm cov hniav uas tuaj yeem npub thiab tsis muaj xim. Hauv tebchaws Canada, tsoomfwv tau siv cov cai tswjfwm txog cov dej haus zoo. Txhawm rau txhim kho qhov zoo ntawm qhov ncauj, cov tshuaj fluoride concentration yog kho hauv cov dej haus. Lub Chaw Haujlwm Saib Xyuas Kev Kho Hniav tau tsim nyob rau xyoo 2004.

Qee cov zaub mov lossis dej haus muaj qhov cuam tshuam rau cov hniav daj, yog li qhov tseem ceeb ntawm kev txhuam hniav. Cov khoom noj no ua rau cov enamel. Cov no yog: - kas fes - cawv liab - tshuaj yej - dej qab zib xws li coca-cola - txiv hmab txiv ntoo liab - khoom qab zib

Kev tu qhov ncauj zoo yog qhov tseem ceeb. Nws tiv thaiv cov kua qaub thiab kab mob hauv lub qhov ncauj. Yog li ntawd, nws yog ib qho tsim nyog yuav tau txhuam koj cov hniav tsawg kawg ob zaug hauv ib hnub rau 2 feeb. Floss ua haujlwm qhov twg txhuam hniav tsis tuaj yeem. Txhuam koj cov hniav tshem tawm tartar thiab pab tswj cov hniav dawb ntawm koj cov hniav.

Txhawm rau tiv thaiv lawv cov hniav daj, qee cov neeg siv cov hniav ntxuav hniav dawb nrog kev siv hydrogen peroxide (= hydrogen peroxide). Qhov kev xyaum no tsis yog yuav tsum tau coj maj mam. Kev siv tsis raug ntawm hydrogen peroxide tsis muaj zog thiab ua rau cov hniav rhiab heev. Yog li kev kuaj qhov ncauj yog qhov ntau tshaj qhov tsim nyog. Txawm hais tias nws tshwm sim los ntawm kev zoo nkauj lossis kev kho mob, kev kho hniav yuav tsum ua raws li cov cai nruj heev.