1. Cov xim ci ntsa iab thiab cov duab dais ntxim hlub yog cov menyuam yaus txhua lub hnub nyoog nyiam, ua rau kev noj mov lom zem 2. Cov khoom siv silicone qib zaub mov 100%, uas ua tau raws li cov neeg siv khoom xav tau rau kev noj qab haus huv ntawm menyuam yaus 3. Tsis plam, lub hauv paus nqus, tsim qauv tsim nyog 4. Yooj yim ntxuav thiab nqa, tiv taus kub siab