To Mask or Not Mask

Several weeks ago, I visited a Orthopedic Doctor about my lower back and once he joined me in the Exam Room, I immediately noticed that he was not wearing a face mask, so I asked him about that and his reply was:  "face masks don't really help you, wearing them helps the other person, plus it you keep your distance, wash your hands often, you don't really need to wear a mask..."  He went on to say that face masks do not really filter out all the particles and the only mask that does that is an N95 mask.  So, wearing any other mask is a sense of false security.

However, even if it is a sense of false security, wearing a mask is better than nothing, I would think.

A much bigger question is:  Does our Federal Government have the right to mandate wearing a mask or is that right reserved for only the State Government to mandate?

"In American political discourse, states' rights are political powers held for the state governments rather than the federal government according to the United States Constitution, reflecting especially the enumerated powers of Congress and the Tenth Amendment." Wikipedia

President Trump makes the claim that mandating the wearing of face masks is the responsibility of the State Government not the Federal Government...  and, there are those who criticize him for that because he is giving up his responsibility and the government's responsibility to take care of the people...

Interestingly, some of the Governors (especially Democratic ones) don't agree with him...  WHY?