Raws li cov khoom siv, nws muab faib ua: cov khoom tiv thaiv kaum pob thiab daim phiaj daim ntaub tiv thaiv kaum;
Lub kaum pob kws tiv thaiv kev faib tawm tau muab faib ua: sab nrauv lub kaum pob thaiv kev tiv thaiv (ntsia tau rau hauv qhov chaw tiv thaiv lub kaum tsev ntawm lub kaum tsev), sab hauv lub kaum pob thaiv kev tiv thaiv (ntsia hauv qhov chaw recessed ntawm lub kaum tsev ntsa) kev tiv thaiv ib daim hlab, U-zoo li tus sib faib zawj;
Lub kaum pob kws tiv thaiv kuj tuaj yeem faib ua: rwb thaiv tsev kaum kev tiv thaiv ib puag ncig thiab kho kom zoo nkauj lub kaum pob kws tiv thaiv.
