Holy crap...so 18 bearded men turned out to be dirtier than 30 dogs?they only studied 18 men with beards and 30 dogs
Mine started doing that until I started washing it with an anti-dandruff shampoo. These days, my entire head and face get washed in one go with the stuff.I found that full on beard also invites dandruff. It's just too much maintenance for me