While ceramic braces certainly offer a less conspicuous look, there is still another system that allows fixed braces to be truly invisible. In some situations, special appliances called lingual braces can be placed on the tongue side of the teeth. They work the same way other metal braces do—but even though they're made of metal, they can't be seen, because they're hidden behind the teeth themselves!
Lingual braces aren't the proper treatment for every orthodontic condition. Special training is required to install them, and they're significantly more expensive than standard braces. They also generally require a bit more time for the wearer to get used to them, and they may slightly prolong treatment. But if you want the least visible type of fixed appliance—and if you're a candidate for this treatment option—then lingual braces may be just what you're looking for.