The fang works because of the basilisk venom, which is one of the two methods we see in the series of destroying Horcruxes (the other being feindfyre).
Hermionie notes that other magical things of similar potency should work, but we also know that basically nothing else in the setting is powerful enough given that a wizard spent like 15 years trying to destroy a horcrux. So sure, it was easy, but destroying the One Ring would be pretty easy too if you were a Golem that found the ring in the middle of Mt. Doom, all it would have to do to destroy it would be just dropping it a few feet away in the lava.
The only thing in Middle Earth capable of destroying the ring is Mt. Doom, but that doesn't mean that beings of sufficient magical potency (eg. the Valar over in Valinor) or powerful enough magical weapons couldn't destroy it just fine. I wouldn't be all that surprised though if feindfyre couldn't destroy the One Ring (although I have no doubt it would destroy the lesser rings), but I would be extremely surprised if the wizards couldn't come up with some kind of magical containment for it at the very least given how magically innovative their society is.