Thaum xaiv cov khoom tu tawv nqaij, nws yog ib qho tseem ceeb los xav txog koj hom tawv nqaij thiab cov kev xav tau tshwj xeeb. Rau cov tawv nqaij rhiab heev, xaiv cov khoom uas tsis yog - khaus khaus, fragrance -dawb, thiab preservative- dawb. Rau cov tawv nqaij qhuav, xaiv cov khoom uas muaj cov nyhuv moisturizing. Rau cov tawv nqaij oily, xaiv cov khoom uas tswj cov roj thiab txo qhov pores. Tsis tas li ntawd, xyuam xim rau cov khoom lag luam cov npe khoom kom tsis txhob ua xua.