My pet has sylavia coming from her mouth, and her gums and teeth look like they are going to fall out. Her gums have an awful oder, and are greenish brownish in color. She was a stray that we found and I need to know what to do for her that is not going to cost alot. It almost looks like it is decaying her teeth away, this has happened very quickly, could it be gum disease or is it something else? Thank you for your time.