I've been trying to stock up on some of the preventative and medical items for my new pellets and had some questions about worming. I looked at the past threads and didn't find the info, I apologize if it's repetitive. My first question is at what point should I try deworming? I know some people don't think it's necessary but I think it's probably worth it. Also is a dewormer preventative or does it just kill existing worms? Thanks for any info you have.