Extraction or not

The underlying problem

Crowding means more tooth than arch. There are only three ways to resolve that: make the arch bigger, make the teeth narrower, or remove a tooth. Each has a legitimate place, and each has limits that are ignored more often than they should be.

The options

• Expansion. Widening the upper jaw creates real space, and it works best while the suture is responsive. In an adult, conventional expansion tips teeth outward rather than widening the jaw, and pushing teeth beyond the bone that houses them causes recession.
• Interproximal reduction. Removing a fraction of a millimetre of enamel between teeth can recover a few millimetres across an arch. Useful in mild cases, insufficient in severe ones.
• Distalisation. Moving the back teeth backwards, often with TADs. Effective within limits set by anatomy.
• Extraction. Usually first premolars, providing around seven millimetres of space per side. The definitive answer for severe crowding or marked protrusion.

What tips the decision

Severity of crowding, how far the front teeth stand relative to the face and lips, the gum and bone available around the lower incisors, the profile, and the patient's age and remaining growth. Severe crowding of ten millimetres or more per arch generally requires extraction; trying to avoid it produces flared incisors, recession and a result that relapses.

Where early treatment fits

Getting the jaw relationship and arch width right while a child is still growing is genuinely one of the ways extractions are avoided later. That is a real argument for examining children early and intervening where it will change the trajectory — not an argument that extractions are a failure. Where a tooth needs to come out, removing it is the right treatment, not a compromise.

Be wary of any practice that advertises itself as never extracting. The bite decides, not the philosophy.