Lub npog ncauj npog cov stratum mob ntsws ntawm daim tawv nqaij, muab dej noo rau stratum corneum, thiab tag nrho hydrates lub stratum corneum los txhim kho cov tsos thiab ywj ntawm daim tawv nqaij; nws muaj cov tshuaj pleev kom ntub dej thiab muag muag, thiab muaj qhov sib khi, uas tuaj yeem txo qhov kev puas tsuaj ntawm daim tawv nqaij noo thiab ua rau cov stratum corneum muag muag. Txhawm rau txhawb qhov nqus ntawm cov khoom xyaw nquag los ntawm daim tawv nqaij.
Thaum lub sij hawm ziab khaub ncaws thaum noo noo nqus, lub npog ncauj yuav ua rau daim tawv nqaij ua kom haum, thiab cov khoom sib khi yuav ua rau daim tawv nqaij kub thiab tsis tu ncua thiab txhawb kev ncig ntshav.
Hauv kev txheej txheem ntawm tev tawm los yog ntxuav tawm ntawm daim npog ib nrab los yog yaug tawm, nws tuaj yeem tshem tawm cov tawv nqaij tuag thiab cov av ntawm cov tawv nqaij, thiab muaj qee yam ntxuav kom huv.