They help draw out discharge, flush out cellular contaminants and prevent infection. They also stimulate circulation and encourage speedy healing. You can use soaks both for general healing and to treat minor infections and irritations. We highly recommend soaking your piercings several times a week, up to several times a day when infected. Epsom salts are really too strong and are not meant for surface wound soaking.
Many kosher salts are natural sea salt.
For facial piercings, you can pour some of the mixture into a shot glass, medicine cup or Dixie cup and press that to your skin to make a tighter seal. Soak piercings as often as possible, or several times a day to treat infection. Jewelry can be changed after healing, but should never be left out even for short periods of time. These piercings close very quickly without jewelry, sometimes within a few hours. This is especially true of tongue piercings.