This is a BTN mask.

（BTN＝Better Than Nothing）

It has little effect on preventing the virus from entering the body,for example, SARS-CoV-2 and influenza virus.

There are various effects of the mask.

1. Prevent splashing splashes due to conversation, coughing or sneezing
2. Prevent inhalation of large dust particles such as pollen and PM2.5
3. Prevents touching mouth with dirty hands
4. Warm and moisturizing mucous membranes of the nose and throat
5. Wearing a mask eases crowds and anxiety about new viruses
6. Some masks fill the sense of belonging to a group

As is often said, even if it is difficult to prevent the virus from entering the body with a mask, in 3.4., It is thought that there is an effect of making infection difficult to establish.

Also, I think that the mask has a psychological and social role like 5.6.

For this reason, it is understandable that the mental state of buying a mask without being satisfied with cough etiquette.

That said, I think BTN masks are enough for general COVID-19 countermeasures.

If a commercially available mask is not available, make it in time from familiar materials.

In March 2020, commercially available masks seem to be out of stock at the world level.

It is predicted that COVID-19 patients will continue to increase.

There is already a shortage of highly functional masks (N95 and surgical masks) in medical settings.

Insufficient masks will affect medical and dental practice (such as surgery) other than infectious diseases.

We do not want the stagnation of medical activities and the spread of social damage.

Please use a mask suitable for your purpose.