Chewing thiab gnawing muaj txiaj ntsig zoo rau lawv cov hniav, cov pos hniav, thiab cov leeg ntawm lub puab tsaig - cov neeg laus cov dev tuaj yeem ntxuav lawv cov hniav, zaws cov pos hniav, thiab ua kom lawv lub puab tsaig muaj zog los ntawm gnawing.Cov menyuam dev thiab menyuam yaus feem ntau gnaw thaum lub sij hawm txhuam hniav kom txo tau khaus lossis mob.
Chewing tuaj yeem pab dev tiv nrog nyob ib leeg rau lub sijhawm luv.Los ntawm kev muab qhov chaw ntiag tug thiab sijhawm ntau los zom cov khoom ua si uas muaj khoom noj txom ncauj lossis cov pob txha nyoos, dev tuaj yeem kawm siv sijhawm nyob ib leeg, txo qhov kev pheej hmoo ntawm kev sib cais kev ntxhov siab.Nws yog ib qho tseem ceeb uas yuav tau muab cov khoom ua si zom thiab ib yam dab tsi ua thaum tso tus dev nyob ib leeg hauv tsev.