A dust mask is worn in the same fashion as a filtering facepiece respirator or surgical mask, but it is dangerous to confuse them because they each protect against specific airborne dangers. Using the wrong mask for a job can present a significant and possibly deadly danger as many dust masks with widely varied levels of protection may look similar, and even masks that do not protect against dust at all. Misfitting masks are also a danger as they allow a material to bypass the mask entirely.