re: Why did our Presidents stop growing facial hair?

Interesting bit of Presidential trivia - not counting sideburns (such as John Quincy Adams) - all Presidents were clean shaven until Lincoln - then all Presidents from Lincoln (1861) through Taft (through 1913) sported facial hair except Andrew Johnson and William McKinley.

That was also the worst run of luck for Presidents, with 3 shot to death and 1 impeached, although that was not directly related to the facial hair as McKinley was one of the "shot to death" and Johnson the "impeached" one.

Since Taft, not only have we had no Presidents with facial hair, there have only been 2 major party candidates to sport facial hair (both Republicans) bearded Charles Evan Hughes (lost to Woodrow Wilson in 1916) and mustachioed Thomas Dewey (lost to FDR in 1944 AND a close one to Harry S. in 1948).

The more you know...