Cov khoom xyaw hauv cov khoom siv kho qhov ncauj yuav tsum ua tau raws li cov qauv kev nyab xeeb siab, txawm tias tsis yog txhua yam khoom siv yuav tsum yog zaub mov- qib. Txij li cov khoom xws li tshuaj txhuam hniav thiab tshuaj ntxuav qhov ncauj tuaj rau hauv kev sib cuag nrog lub qhov ncauj ncaj qha thaum siv - thiab cov khoom me me tuaj yeem noj tau - cov neeg tsim khoom feem ntau xaiv cov khoom xyaw uas tau soj ntsuam kev nyab xeeb thiab ua raws li cov kev cai cuam tshuam kom muaj kev nyab xeeb thaum siv.
Txawm hais tias qee cov khoom xyaw hauv cov khoom siv kho qhov ncauj yog cov zaub mov tiag tiag- qib lossis tsim nyog rau kev siv hauv cov zaub mov- xws li cov khoom qab zib, humectants, thiab flavoring agents uas yuav tsum tau muaj kev nyab xeeb siab vim muaj kev pheej hmoo ntawm kev sib tsoo los yog lub qhov ncauj ntev ntev - lwm cov khoom xyaw ua haujlwm (xws li, tshuaj ntxuav tes, thiab cov tshuaj abrasives) {5} cov qauv tshwj xeeb rau cov khoom siv kho qhov ncauj thiab tsis tas yuav poob rau hauv qeb ntawm cov khoom noj ntxiv.
Tshaj li qhov kev nyab xeeb ntawm cov khoom siv raw lawv tus kheej, cov khoom siv kho qhov ncauj yuav tsum suav nrog cov khoom sib xws, kev ruaj ntseg, thiab cov teebmeem ntawm kev siv sijhawm ntev -. Txawm hais tias cov khoom xyaw muaj kev nyab xeeb thaum siv nyob rau hauv kev sib cais, kev tsim qauv kev tshawb fawb thiab kev soj ntsuam zoo yog qhov tseem ceeb los xyuas kom meej tias nws tsis cuam tshuam rau lub qhov ncauj ib puag ncig lossis cuam tshuam cov khoom lag luam. Yog li ntawd, cov khoom lag luam muaj npe nrov feem ntau dhau los ua cov txheej txheem nruj nrog kev tshuaj xyuas cov khoom siv raw, kev ntsuas kev nyab xeeb, thiab kev ntsuas kev ruaj ntseg.