1. Txias lub boiling dej rau 5 feeb tom qab boiling rau scalding lub qhov ncauj.
2. Muab lub qhov ncauj qhov ntswg rau hauv dej kub rau 10 vib nas this, tshem tawm thiab muab tso rau hauv lub qhov ncauj thiab maj mam tom, qhov yuav tsum tau yog kom tso ib tug imprint rau lub qhov ncauj qhov ntswg, tab sis nws tsis tuaj yeem tom.
3. Yog tias cov kauj ruam dhau los tseem nyuaj dhau, koj tuaj yeem tso cai rov qab.
4. Tom qab tus neeg zov lub qhov ncauj tawm ntawm qhov imprint, tos kom nws txias thiab teem caij, thiab nws tiav lawm.
5. Thaum sib tw, hnav lub qhov ncauj, thiab cov hniav thiab cov imprint yog tag nrho occlusive.
Lub luag haujlwm tseem ceeb ntawm tus neeg saib xyuas lub qhov ncauj tsis yog tsuas yog tiv thaiv cov hniav, tab sis kuj nqus thiab cushion kom txo tau lub taub hau.
