No, braces don't always work 100% in every single case, but they are highly effective.
The provided reference indicates that braces will make a change to everyone's teeth with only one exception: when teeth are fused to the bone. This is extremely rare, usually linked to past trauma, and can be identified before treatment begins. Therefore, while braces are almost always effective, complete success hinges on this one factor.
In summary:
- Braces are generally highly effective: They almost always move teeth as intended.
- Rare exception: Teeth fused to the bone will not move. This is very uncommon.
- Diagnosis is key: This issue is usually identifiable before treatment.
