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It'd probably be better to have it as cosmetic, since gold is so soft it deals less damage when you use it as a weapon. When you have enough money, though, you could always upgrade to mithril dentures. Counts as silver, doesn't take -1 to damage rolls, and then you could always make them Thundering or Dancing or something.

Pizza Lord |
... I was wondering if I could make his bite made of gold, or would that be purely cosmetic?
If his teeth or other biting implements were predominantly made of gold, then absolutely it should count as gold for purposes that require it. If it were to that extent, you would apply the other qualities of a gold weapon to your bite attack that TheGreatWot mentioned, –2 to damage if the bite is piercing or slashing, which most bite attacks are (in addition to bludgeoning), it could be different on a creature-by-creature basis, but your orcish tusks probably are.
There's no specific DR/gold creature that I can recall (but that doesn't mean there couldn't be). But yeah, just like if you had wooden teeth, if a creature's DR was somehow bypassed by wood, that would work (it would have to be more than just one or two wooden teeth or more than a gold-capped tooth or silver filling, however. Similarly, if you bite a rust monster or an ooze or something that dissolves metal, you need to understand that it goes both ways.

UnArcaneElection |

Rust monsters specifically rust even non-ferrous metals, including adamantine, mithril, and even enchanted alloys (unless specifically immune to the rusting effects of a rust monster, of course).
Which is weird when you come to think of it, but I just checked my AD&D 1st Edition Monster Manual, and it goes all the way back to then (maybe even to Basic/Expert, but that's better hidden in my piles of stuff).

Pizza Lord |
Yep. Not to get off thread topic too much, but when Gary Gygax makes a weird monster, he goes all out. I think it was inspired by a tiny, plastic 'dinosaur' he found in one of those cheap dollar store packs (I think they called them five-and-dime stores). Said "What the heck is this thing? Hell, I'll create a monster that looks like it."