In Vietnam, the Covid-19 epidemic has almost radically changed the habit of not wearing masks in public places of Vietnamese people. The price fever of masks right in the first outbreak at the beginning of the year is a very clear example. When the Covid-19 epidemic returned to Vietnam with cases of community infection in Da Nang in the past few days, the price of masks increased again. However, people no longer see people rushing to buy masks anymore. The effect of masks is that most agree that frequent hand washing with soap and antiseptic solutions is a more important and even more effective measure to prevent epidemics. And when the Covid-19 epidemic returned, bottles of hand sanitizer appeared in elevators, doors of cinemas, supermarkets and agencies and organizations. Hand washing is also becoming a habit thanks to Covid-19.