Scientists have concluded that sufficient heat can destroy the virus that causes COVID-19 in a conventional surgical mask. The mask itself does not deteriorate.
A temperature of 70 degrees Celsius is said to kill 99.9% of SARS-CoV-2 viruses. This is in line with safety standards. You need to work on the mask for five minutes. Even an oven is supposedly suitable. It is not worth raising the temperature, as the material may begin to deteriorate.
It should be noted that this is only news so far, information should not be considered a guide to action. Timely changing a medical mask is still considered one of the most effective methods of protection against COVID-19.