Self-ligating braces replace the elastic or metal ties used in conventional braces with a built-in sliding door or clip mechanism that holds the archwire directly in the bracket slot. When the clip is closed, the wire can slide freely — this is the key mechanical difference. In conventional braces, the elastic tie presses the wire against the bracket, creating friction. The lower friction in self-ligating brackets allows the wire to express its full force more efficiently, which can accelerate initial levelling and alignment.
The concept of low-friction orthodontics emerged in the 1930s but became commercially prominent in the 1990s with the introduction of the Damon System. The clinical rationale is sound: reduced friction means lower applied forces, which theoretically means more biologically comfortable tooth movement and potentially less patient discomfort. The mechanism is real — the debate in orthodontic literature is about how much clinical benefit it actually delivers versus how much is marketing amplification.
Self-ligating braces can be used for the same range of cases as conventional metal braces. There is evidence they offer genuine advantages in the initial levelling and alignment phase (first 6–12 months of treatment) — particularly for moderately crowded cases where low-friction forces help teeth slide into position along the archwire. For finishing and bite correction phases, the advantage narrows considerably, as high-force mechanics are needed regardless of the bracket type.