You know, the printed expiration date is not a sign as to when it will be bad for you. The date printed on a milk carton is atleast seven days off as required by law for sales purposes. As long as it remains sealed it's fine. As for toothpaste, the expiration date still doesn't mean much. EVERYTHING expires at some point, thats just something that needs to be accepted. Toothpaste is not ingested into your system though, so the expiriation date, however many days or months off it is, does not mean it will make you sick. Its more of a, "This toothpaste will work better if you use it before _________." So, to answer your question, the explosive diarrhea and other weird poops youve been having are more a function of your meals than your dental hygiene. Diarrhea is natural, take dome Immodium AD if its bothering you, that stuff works miracles.