Cov dej tev tawm hloov pauv txoj hauv kev ntawm kev ntxuav cov tawv nqaij los ntawm tes nrog kev xyaum ua tus kheej.Cov tawv nqaij sib tsoo tshuab txais cov txheej txheem ntse tswj lub tshuab nqus tsev nqus hom, los ntawm kev sib xyaw ntawm cov khoom thiab cov khoom siv los txhim kho daim tawv nqaij zoo.Cov roj tseem ceeb, cov khoom siv ntxuav hniav dawb, lactic acid, salicylic acid thiab lwm yam khoom siv nrog cov haujlwm sib txawv kom tau raws li ntau yam kev xav tau ntawm cov neeg siv khoom.