Thaum twg cov tshuaj txhuam hniav fluoride tau qhia?

Cov txheej txheem:

Thaum twg cov tshuaj txhuam hniav fluoride tau qhia?
Thaum twg cov tshuaj txhuam hniav fluoride tau qhia?
Anonim

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.

Thaum twg cov tshuaj txhuam hniav tau fluoride?

Cov neeg tsim khoom tsim cov tshuaj txhuam hniav fluoride los pab tiv thaiv kev xeb hauv 1914. Cov neeg tsim khoom thiab cov kws kho hniav pom tau hais tias cov tshuaj txhuam hniav txhuam hniav tuaj yeem hnav lossis ua rau cov hniav puas tsuaj, yog li cov tshuaj txhuam hniav uas muaj qhov abrasiveness tsawg heev kuj tau tsim.

tshuaj txhuam hniav fluoride tau tsim nyob qhov twg?

kev tshawb fawb txog tshuaj fluoride tau pib thaum xyoo 1901, thaum lub tsev kawm kho hniav hluas uas kawm tiav npe hu ua Frederick McKay tawm sab hnub tuaj sab hnub tuaj mus qhib kev xyaum kho hniav hauv Colorado Springs, Colorado. Thaum nws tuaj txog, McKay xav tsis thoob thaum pom cov qhab nia ntawm Colorado Springs cov neeg nyob nrog cov xim av grotesque ntawm lawv cov hniav.

Puas muaj fluoride hauv kuv cov tshuaj txhuam hniav?

Tab sis Hewlett hais tias tsis yog fluoride hauv cov tshuaj txhuam hniav xwb, nws tseem yog cov khoom xyaw ntuj. Fluoride yog ib qho tshwm sim ib txwm muaj, nws yog qhov xwm txheej ntawm kab noj hniav.

Cov tshuaj txhuam hniav twg muaj fluoride?

Cov no yog tsib cov tshuaj txhuam hniav muag muag nrog cov tshuaj fluoride uas muaj ADA foob

  • Colgate Total Whitening Paste Tshuaj Txhuam Hniav.
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  • Colgate Optic White Teeth tshuaj txhuam hniav kom dawb.
  • Tom's Of Maine Anti-cavity Toothpaste.

Pom zoo:

Nthuav cov khoom
Vagabondish txhais li cas?
Nyeem ntxiv

Vagabondish txhais li cas?

Tus neeg tsiv ntawm qhov chaw mus tsis muaj tsev nyob thiab feem ntau tsis muaj kev txhawb nqa. adj. Ntawm, hais txog, los yog yam ntxwv ntawm ib tug vagabond. intr v. vag·a·bond·ed, vag·a·bond·ing, vag·a·bonds. lo lus vagabond txhais li cas?

Puas ib lub hlis twg duas muaj ridges?
Nyeem ntxiv

Puas ib lub hlis twg duas muaj ridges?

Tseem muaj 119 ridges los yog reeds ntawm ntug ntawm ib lub hlis twg, 118 ntawm dime thiab 150 ntawm ntug ntawm ib nrab duas (feem ntau tam sim no ib tug sau). Puas yog lub quarter uas tsis muaj ridges muaj nqis dab tsi? Cov no tsis yog qhov yuam kev thiab tsis muaj nuj nqis.

Yuav ua li cas rau footless jo?
Nyeem ntxiv

Yuav ua li cas rau footless jo?

Ib tug poj niam Colorado tau sau ntawv zoo rau nws pob taws ua ntej txiav txim siab txiav txim siab txiav nws, tom qab xyoo ntawm kev mob hnyav los ntawm kev raug mob qub. Ua ntej nws txoj kev phais txiav tawm thaum Lub Kaum Hli, Jordan "