Thaum siv cov ntim ntim yas, koj yuav tsum paub seb koj cov khoom puas tuaj yeem siv tau hauv cov ntim yas ntim khoom. Vim tias qee cov kua tshuaj siv cov ntim cov yas, lawv yuav corrode lub ntim yas ntim nws tus kheej thiab ua teeb meem thaum thauj cov khoom. Thaum siv lub thawv ntim khoom, sim piav qhia nws nrog cov chaw tsim khoom ntim yas ntim khoom, thiab qhia rau lub chaw ntim khoom ntim yas kom ntxaws txog yuav ntim li cas, yog li cov chaw tsim khoom ntim ntim yas tuaj yeem muab tswv yim zoo rau koj li kev xav tau. Thaum siv cov ntim yas ntim khoom, nco ntsoov xyuas kom tsis muaj teeb meem thaum thauj mus los vim muaj pob tw ntawm txoj kev.
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