Bests & Worsts Reviews from Amazon

We have been using this product for our dog a few years now. We bought two tubes on 9/12/18 from Amazon. After opening one of the new tubes, our dog resisted having her teeth brushed which she never had before. When squeezing out a glob recently a dark oozy substance squeezed out! It was either mold or it was spoiled! The return policy has expired to return to Amazon. I am writing the maker to see what they will do. Had my dog gotten sick all hell would have broke loose!