Spiky thiab ntse nyob qhov twg koj saib: tus kheej-ntse mechanism ntawm hiav txwv urchin hniav
Cov neeg feem ntau koom nrog kev sib tham txog cov hniav nrog caries, braces thiab sadists hauv cov tsho dawb uas tsuas yog npau suav ntawm kev ua hlaws ntawm koj cov hniav. Tab sis tso dag tso tseg, vim tias tsis muaj kws kho hniav thiab tsim cov cai ntawm kev huv ntawm qhov ncauj, koj thiab kuv tsuas yog noj cov qos yaj ywm thiab kua zaub los ntawm cov quav cab. Thiab txhua yam yog vim [...]