I dont know that it is in his mouth, it definetely started outside of his mouth and has spread right up to it, I'll have to see if theres a different vet in a nerr by city since my previous vet seemed to feel a garter snake wasnt worth the effort and even went as far as to insult the his colors and appearce and brag to me about some garters in a locale in different part of the country that were "far prettier than this guy". Anyway, sorry im just mad at the vet. thanks for your help everyone and I will try my best