Change your preferences here.
Increases the power of all of the holder's damage-dealing Dragon-type attacks by 20%.
Dragon Fang isn't bad, but it isn't that good either. While a 20% boost to Dragon-type attacks is decent, it's not quite as excellent as the 30% boost to all attacks that you get from Life Orb. If you don't like Life Orb's recoil damage, or want to try to bluff a Choice item, then Expert Belt is typically a better overall choice for its added damage to all super effective attacks. Even if you are running a mono-attacking set on something like Latias, either Leftovers or Life Orb would probably be better for your purposes, depending on your build.
Dragon Fang could theoretically be used on Pokemon such as Latios and Hydreigon, which typically rely on their Dragon-type attacks to cause damage, in order to bluff a Choice set and hence catch an unsuspecting Pokemon off-guard, as both of these Pokemon will commonly run Choice sets. However, the loss in power is noticeable.
Dragonspiral Tower, 4F.