"Safe to swallow - On the back under Warnings: among other things -- to prevent contamination, replace cap after each use. Keep out of reach of children. Store at below 77 degrees. Use within 3 months after opening. Contains milk and egg derivatives." Yeah - that is what was on the label but did I read it before ingesting it? Uh - that would have to be a big fat NO. Page had encouraged me to please use the oral balance dry mouth moisturizing liquid at night before going to sleep. I did and woke up very soon after with a horrible burning sensation in my throat and down into my chest. After violent coughing for several minutes I proceeded to throw up over and over until only nasty bile was coming. It wasn't pretty and I felt rotten for quite awhile. SO - I decided to look at the label and realized it has been open for nine months. Color me totally DUMB. In my defense though - who would think that mouthwash would go bad? I mean, really!