Hi Dave and Ren,
the tongue prob is very common and to my opinion it comes down to the vitB in most cases. I had three cases of tong disfunction in the last five years(veiled and pardalis),one had to be amputated after the animal swallowed and started to digest it(panther). It usually appears in a period in which the chams grow pretty fast,sometime between two and seven month. At least in two cases I only used one mineral/vit product,which I always thought to be great(and it is for the mineral side of nutrition). Taking a closer look,I found out that there wasn't any vitB in it at all. After using a second(german) product with vitB I never had probs again. The most heard of cure for this problem in europe(to my knowledge) is ,like Tom said ,to give a vitB complex with a pipet every day. The complex is made for humans and can be bought at every pharmacie(tablets or liquid). Im pretty shure the vet told me that vitB can't be overdozed cause it will not get stored in the body,so no worries(but maybe you ask a vet again). First stage of the tong problem is that they can't shoot as far. In a further stage the tong always seems to pull upwards and even close feeders (3cm) are missed. A even worse case is ,that the whole tong "falls" out of the mouth and can't be retracted? without problems by the animal. If they manage to get it back in again ,its often not proper positioned on the bone of the tong(sorry for my bad english,dont know the right words...).In this case it can be swallowed and will be digested, so the animal tries to let's say vomit it out.. If the tong isnt affected at this point vets sometimes fiddle? the tong on the bone and position it with a stich for a couple of weeks. Together with the vitB therapy and high UV showers(High UVB Output Mercury Vapour Lamp) this often does the job,but to be honest, in a lot of cases it will not get better after a certain point. To my opinion the key to sucess is to get active at first time the problem showes,waiting to look how things develope doesn't make things better,usually anyway. This is just the experience I made with the topic,but I'm no vet.
If the tong has to be amputated the animals learn to catch theire food like other lizzards like beardies. The main problem isn't to catch the feeder,but to swallow it,as the tong has a major part in transporting the food down the throat. Same prob with drinking. It takes a while for the animal to understand(if ever) that the tong is missing. My panther tried to shoot at crickets for over a year after amputation,always did this four or five times before catching them with his mouth.
Ive heard about using vitB for appetite stimulation too,but most of the people who use this(the ones I know) give it by injection in the muscles of a leg. I never had to do this,so ive got no personel experience with this.
By the way i never ever use additional vit-products next to the mineral/vit-products I use. To my opinion these pure vits are often to high in dose. Who knows how much a chams liver or kidney can handle? Most time these products are made for herps in generall,I doubt that beardies require the same amounts then chams... I trie to give the good stuff by gutloading the feeders with a lot of different things,works well for me.. Whats youre opinion on this?
regards
) with vitamin B complex (usually B1 (thiamine), B2 (riboflavin), B6 (pyridoxine) and B12 (cobalamin)) treatments on someone else's chameleon 
