John Robert, a microbiologist in New Mexico did an experiment on whether the beard contained bacteria. Results from the experiment that beards contain a lot of bacteria as dirty as a toilet. That’s a lot of bacteria and it’s a bit unsettling. He advised men with a beard should wash hands frequently and wash beard if they want to have a clean and healthy beard. Also, take care not to get food on your beard when you eating. If you exercise outside for a long time under the hot weather, there will be massive secretion of oil and have a lot of dust in your beard. If you haven’t clean your beard in the time it’s very easy to damage your sink. In particular, the bacteria on the surface of the face will take advantage of this, causes folliculitis and sebaceous adenitis, even cause swelling of the lips and face.