My Iron Helmet breaks 2.5 faster with Unbreaking II! More like Breaking II!
Comments 3
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Helmets have significantly less durability than the other parts of the set (followed by boots, then leggings, then chestplates). Unbreaking doesn't extend that durability, it just decreases the chance of whatever it's enchanted on from taking each point of durability that would be taken away normally. For armor with Unbreaking II, this is a 26% chance (27% if Bedrock rounds it up like Java, unsure which). You've probably just been unlucky, all things considered.
If you have Thorns on that helmet, that could do it as well. Each time the Thorns enchantment deals damage, it takes an extra 3-point durability penalty. With Unbreaking II you do get the normal 26% chance of not taking each of those 3 points, but it'll still wear your helmet out faster.