Cov cim dej yog vim kev tsim kho nano txheej tom qab lub tsheb ntsib los nag los yog dej ntws, tsis txhob muab ntxuav kom sai, tom qab lub hnub raug, qhov xim ntawm qhov chaw tom qab cov evaporation ceev nrooj. Yog li, tom qab kev tsim kho ntawm cov tshuaj pleev xim iav, yuav tsum tau zam hauv cov huab cua kub sab nraum zoov kev ntxuav tsheb, lub tsheb ntxuav yuav tsum them sai sai rau lub cev, sim ua kom ntxuav tom qab los nag.
iav txheej manufacturers muaj ib txwm tau dej tias yog thawj qhov teeb meem ntawm kev tshawb nrhiav thiab kev loj hlob, nyob rau xyoo tas los, ntau cov khw tsim tawm siv cov iav los ntawm cov iav los yog cov tshuaj fluoride tom qab plating siv lead ua los tiv thaiv dej cim. KISHO ntawm Nyiv Chaw Tsim Tshuaj Tsim cov iav cellulose, tuaj yeem ncav cuag 90% kom tsis txhob muaj dej cim.
