According to CDC guidelines, masks serve to protect mucous membranes. These properties in the mouth and nose are very susceptible to infection. If there is contact between the mask and the mentioned areas, there is a risk that harmful debris will escape.

Also, the quality of both dentists must pay attention to the level of fitness. For masks to be effective, they must have a firm seal around the edges. If the device is not installed properly, there is a risk of media contamination. You can simply view high quality face shields in Australia at for safety purposes.

The most important property to consider is the PPE mask. This means "bacterial filtration efficiency" and refers to the percentage of pathogens that the mask will filter out. 

A related concept is pore size, which corresponds to the type of particles passing through it. Different circumstances have different requirements for protection. Therefore, dentists should always consider the types of bacteria they may encounter before choosing a mask.

The factor to consider is the material from which the mask is made. Some of the cheaper models can get damaged if they get wet. This damage renders the mask ineffective. 

Again, the doctor's needs will differ from case to case, but a more fluid-resistant material is usually desirable. Another element that can make masks ineffective is aerosol exposure. When using this substance, the mask should be changed every 20 minutes.