To protect you from CoronaVirus you should use Mask properly. One must Maintain mask guidelines for put on, using, take off and disposal.
Use of MASK for protecting you from corona virus – convid19
When to use a mask?
Before putting on a mask
Fully Cover Mouth and Nose
Avoid Touching the Must While using it
Replace the Mask with new one
How to Remove the Mask?
Read .. coronavirus symptom personal care & treatment
source: https://www.who.int/emergencies/diseases/novel-coronavirus-2019