You want to avoid direct contact with MMS and metal because of its ability to oxidize. If contact does occur, you want to rinse as soon as possible. If you drink the MMS, I would drink a glass of water (or rinse your mouth) after the MMS dose, just to eliminate any chance of oxidation from happening. Dr. Tom Hesselink has some great information about the oxidizing properties of MMS at http://mmsmedicalresearch.com/
Hope you found this information useful.