He also said they won't overeat no matter what you feed them. He also says if they will chew on wood that will help with the teeth
Hmm, maybe someone else could comment on whether or not pigs can overeat. Mine will eat and eat until all the veggies are gone - I'd be inclined to think they would overeat.
I've never had a guinea pig chew on wood. If you provide unlimited hay - they usually don't have much use for other things (besides, maybe cardboard). They really aren't chewers in the way the other rodents are. But then, I have a mouse - and have yet to see him chew wood either.
I think maybe I was misunderstood - my pigs eat copious amounts of hay. They have hay racks and hay boxes and toilet paper tubes full of the stuff (Kleenmamas). I'm just trying to be proactive in preventing teeth issues in the future.
I think Mum's right - it'd be awfully hard for me to provide all that they need myself. They do get a variety of veggies twice daily, but it's hard to calculate just how much of a vitamin is present in any given vegetable.
I think I might just further ration their pellets (at least the healthy boys).
Thanks everyone for your comments!