Cog raws li cov khoom siv tu tawv nqaij yuav luag tag nrho cov txheej txheem ntawm kev tu, tiv thaiv tshav ntuj, thiab kev tu tawv nqaij.

Cov txheej txheem ntawm cov nroj tsuag raws li kev saib xyuas tawv nqaij yog qhov ntev, tab sis cov nroj tsuag zoo raws li cov khoom xyaw ua kom pom cov tawv nqaij zoo.

Thaum xaiv los siv cov khoom tu tawv nqaij dawb huv, koj yuav tsum xub nkag siab txog koj cov tawv nqaij thiab qhov ua tau zoo ntawm ntau yam khoom xyaw cog.

Arbutin los ntawm ntuj dais txiv hmab txiv ntoo thiab yog tsuas yog siv los kho pigmentation. Lub caij no, arbutin yog maj mam thiab tuaj yeem siv tau txawm tias koj yog ib pab pawg neeg rhiab heev. Qhov tseem ceeb tshaj plaws, arbutin tuaj yeem siv tau thaum cev xeeb tub, ib nrab hloov cov txiaj ntsig ntawm cov tshuaj pleev ib ce.