I don’t believe we’ve had a President with facial hair since Taft. About 1/4 had facial hair of some sort. I think it’s a residue of the Roman Empire. They believed anyone with facial hair had something to hide.
No president with facial hair since Taft (although a picture of a sickly-looking Wilson with a beard has surfaced), and no major-party candidate with facial hair since Dewey in 1948. Presidents with facial hair were the norm from 1861 (BTW, Lincoln grew his famous beard after he was elected but before he was sworn in) to 1909, with only McKinley and the unelected Andrew Johnson failing to have facial hair, but there were none either before or after such period.
Tom Dewey was a great disappointment.