Video: Thaum twg yog thawj qhov txheej txheem tshuaj dawb qhia?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov hniav tsis tseem ceeb tshuaj dawb pib xyoo 1848 nrog kev siv cov tshuaj chloride ntawm cov txiv qaub (Dwinelle, 1850), thiab xyoo 1864, Truman qhia txog cov txheej txheem zoo tshaj plaws rau tshuaj dawb Cov hniav tsis tseem ceeb, ib txoj hauv kev uas siv cov tshuaj chlorine los ntawm cov tshuaj calcium hydrochlorite thiab acetic acid (Kirk, 1889).
Ib yam li ib tus tuaj yeem nug, thaum twg cov hniav ntxuav hniav dawb tau tsim?
Nws tag nrho yog nyob ntawm seb koj xav ua kom tiav. Cov keeb kwm luv luv: - Kev xyaum ua cov hniav - ntxuav hniav dawb pib nyob ib puag ncig 4, 000 xyoo dhau los nrog cov neeg Iyiv thaum ub, uas tau tsim ntxuav hniav dawb muab tshuaj txhuam siv pob zeb pumice hauv av sib xyaw ua cawv txiv hmab. Dawb cov hniav yog ib lub cim ntawm kev zoo nkauj thiab lub cim ntawm kev nplua nuj.
Qhov thib ob, lub teeb xiav ua dab tsi thaum txhuam hniav? Cov tshuaj txhuam hniav uas muaj hydrogen peroxide yog siv rau koj cov hniav . Lub teeb ua kom emits lub teeb xiav uas ua rau cov gel; lub teeb tsis tawm cua sov, lub ntsiab lus koj yuav tsis ua rau tsis xis nyob los ntawm qhov kub teeb los ntawm cov txheej txheem. Cov hniav dawb gel nkag mus rau koj cov enamel thiab nqa cov stains.
Kuj Paub, dab tsi yog tshuaj dawb hauv kho hniav?
Cov txheej txheem ntawm cov hniav ntxuav hniav dawb ua rau cov xim ntawm cov hniav. Hniav ntxuav hniav dawb tuaj yeem ua tiav los ntawm kev hloov cov xim ntawm sab hauv lossis los ntawm kev tshem tawm thiab tswj kev tsim ntawm extrinsic stains. Cov tshuaj degradation ntawm cov chromogens hauv lossis hauv tus hniav yog hu ua tshuaj dawb.
Cov tshuaj dawb tuaj yeem ua rau cov hniav puas tsuaj?
Tshuaj dawb khoom ua tau muaj ntau yam kev phiv xws li kev puas tsuaj cov hniav hniav ua rau irritation ntawm cov pos hniav, hniav rhiab heev thiab ntau dua. Qee qhov teebmeem no kav ntev; piv txwv li puas mus rau hniav enamel yog tas mus li thiab hloov tsis tau.
Pom zoo:
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