Except $$$$. Yes, some vets WILL lie and do unnecessary procedures just to get the money. Follow your gut on this one.If your vet is telling you that your cat needs a tooth pulled, then he needs a tooth pulled! Obviously you can get a second opinion, but there is no reason your vet should lie to you about this.
This is an old thread and the OP isn't here anymore. . .but really, the vet was being absolutely ridiculous. Fleas and worms from wet food? Fleas from ANY food?!? It's scary who has a DVM degree sometimes.
I leave canned food out for longer than recommended and even so I've never had a problem with flies, and definitely not fleas or worms.