2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Kev tsim cov txhuam hniav ntau tau pib hauv Asmeskas ncig 1885. Ib qho ntawm thawj cov txhuam hniav hluav taws xob los ntaus Asmeskas lag luam yog xyoo 1960. Nws tau ua lag luam los ntawm lub tuam txhab Squibb nyob rau hauv lub npe Broxodent.
Thaum twg cov hniav txhuam hniav tau tshwm sim?
Kev txhuam hniav txhua hnub tau dhau los ua tsaug rau Ntiaj Teb Tsov Rog II, thaum cov tub rog Asmeskas xav kom cov tub rog txhuam hniav ua ib feem ntawm lawv cov kev coj huv txhua hnub. Thawj tus txhuam hniav nylon tau tsim hauv xyoo 1938, ua raws li cov txhuam hniav hluav taws xob hauv xyoo 1960.
Puas muaj txhuam hniav xyoo 1900?
Lub sijhawm xyoo 1900, celluloid maj mam hloov cov pob txha. Cov tsiaj nylon bristles kuj tau hloov los ntawm hluavtaws fibers, feem ntau nylon, los ntawm DuPont nyob rau hauv 1938. Thawj nylon bristle txhuam hniav ua nrog nylon yarn tau muag rau Lub Ob Hlis 24, 1938.
Thaum twg cov txhuam hniav tuaj rau Asmeskas?
Thawj Asmeskas patent rau txhuam hniav tau muab tso rau hauv 1857, thiab kev tsim khoom loj tau pib hauv Tebchaws Meskas 30 xyoo tom qab.
Puas tau txhuam hniav xyoo 1700?
Nyob teb chaws Europe, thawj zaug paub cov khoom txhuam hniav tau ua thaum xyoo 1700, tus txhuam hniav tau tsim qauv yooj yim; ib qho me me ntawm cov pob txha lossis ntoo raug laum nrog lub qhov me me thiab cov bristles tau muab khi rau ntawm txhuam taub hau. Los ntawm 1800s cov hniav txhuam hniav tau tsim ntau hauv ntau lub teb chaws.
Pom zoo:
Thaum twg cov tshuaj txhuam hniav fluoride tau qhia?
Fluoride thawj zaug ntxiv rau cov tshuaj txhuam hniav hauv the 1890s. Tanagra, muaj calcium fluoride ua cov khoom xyaw nquag, tau muag los ntawm Karl F. Toellner Company, ntawm Bremen, Lub Tebchaws Yelemees, raws li kev ua haujlwm thaum ntxov ntawm kws tshuaj Albert Deninger.
Cov khoom xyaw twg hauv qab no ua cov tshuaj tsw qab hauv cov tshuaj txhuam hniav?
Sodium lauryl sulfate (SLS) yog surfactant feem ntau siv. YPuas yog tshuaj txhuam hniav puas yog surfactant? Surfactants. Ntau, txawm tias tsis yog tag nrho, tshuaj txhuam hniav muaj sodium lauryl sulfate (SLS) lossis lwm yam surfactants (detergents).
Puas siv cov tshuaj txhuam hniav puas zoo rau koj cov hniav?
Flossing pab txhawb kev tu hniav zoo vim nws nqa thiab tshem cov quav hniav thiab zaub mov hauv nruab nrab ntawm koj cov hniav. Kev txhuam hniav kuj tshem tawm cov quav hniav thiab cov khoom noj khoom haus, tab sis cov txhuam hniav ntawm cov txhuam hniav tsis tuaj yeem ncav cuag tob hauv nruab nrab ntawm cov hniav kom tshem tawm tag nrho.
Tau dhau los lossis dhau lawm?
Koj tsis tuaj yeem hais tias "tau dhau mus lawm" vim tias qhov ntawd yog kev tsim kho tsis raug thiab "dhau mus" yog qhov tsis hloov. Txoj kev uas yuav hais tau yog "nws tau tas sim neej". VS tau dhau lawm?
Thaum twg cov tub rog tau dhau los lawm?
Ne cavalry pib raug txiav tawm tom qab Ntiaj Teb Tsov Rog I hauv kev pom zoo ntawm kev ua tsov rog tank, txawm hais tias ob peb tus nees nees tseem tau siv rau hauv Ntiaj Teb Tsov Rog II, tshwj xeeb tshaj yog cov kws tshawb fawb. Thaum kawg ntawm Kev Tsov Rog Thoob Ntiaj Teb thib 2, nees tsis tshua pom nyob rau hauv kev sib ntaus sib tua, tab sis tseem tau siv dav rau kev thauj tub rog thiab khoom siv.
