Ntaub hoob nab yog siv rau cov neeg' s kev nyiam huv txhua hnub, thiab yog ib yam ntawm cov ntaub ntawv tsis tseem ceeb rau cov neeg. Txhawm rau ua cov ntawv tso zis tso quav muag, cov txheej txheem siv tshuab feem ntau yog siv los ua daim ntawv txhuam thiab nce qhov muag muag ntawm cov ntawv tso zis tso quav.
Muaj ntau ntau cov ntaub ntawv siv ua cov ntawv tso quav. Cov khoom siv dav siv yog ntuj tsis muaj kuab paug rau raw khoom xws li paj rwb sis plawv hniav, ntoo pulp, xyoob pulp, thiab straw pulp. Ntaub hoob nab yuav tsum tsis muaj tshuaj lom neeg, tsis muaj cov ntaub ntawv nyoos uas ua rau daim tawv nqaij, thiab tsis muaj pwm, kab mob thiab kab mob seem. Siv ntaub so plob yog tus yam ntxwv los ntawm cov dej muaj zog nqus, tsis muaj cov kab mob pathogenic (cov kab mob pathogenic xws li Escherichia coli tsis raug tso cai), cov mos mos thiab cov ntaub tuab tsis muaj qhov, tsis muaj xim tsis sib luag, xim tsis sib luag thiab tsis muaj impurities. Yog tias cov yob me me ntawm ob chav txheej tso zis tso quav ua tsim, qhov punching suab yuav tsum zoo sib xws, lub pinholes yuav tsum pom tseeb, yooj yim dua, thiab ntuag.