---
title: "How Do Braces Work? Orthodontic Tooth Movement UK (2026)"
url: https://virtualconsultant.online/guides/how-braces-work-uk
description: "Braces move teeth by triggering bone remodelling in the jaw. Learn the science behind orthodontic tooth movement, periodontal ligament."
updated: 2026-08-26T00:00:00Z
publisher: Virtual Consultant Online
---

# How Do Braces Work?

Braces apply gentle, controlled pressure to teeth over months or years. That pressure triggers a biological process — bone remodelling — that allows teeth to move through the jaw. Here is how it works, in plain English.

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## The biology of tooth movement

Teeth are not rigidly fused to the jawbone. Each tooth is suspended in its socket by a network of fibres called the periodontal ligament (PDL). These fibres connect the root surface to the surrounding bone and act as a shock absorber during chewing — but also as the biological mechanism that allows orthodontic movement.

When a brace or aligner applies a gentle, sustained force to a tooth, the PDL on the compression side (the direction the tooth is being pushed towards) becomes compressed. On the tension side (opposite), the fibres are stretched. This mechanical signal triggers a cascade of cellular activity:

**On the compression side:** Osteoclasts (bone-removing cells) are activated and begin dissolving the bone in front of the moving tooth, creating space for it to move into.

**On the tension side:** Osteoblasts (bone-forming cells) deposit new bone behind the tooth, filling the space the tooth has left.

This continuous cycle of bone removal and bone formation — known as bone remodelling — is what allows teeth to move predictably through the jaw. It is the same process that heals fractures and allows the jaw to respond to changes in bite load throughout life.

## The components of a brace and what they do

| Component | What it does |
| --- | --- |
| **Bracket** | Bonded to the tooth surface; holds the archwire and transfers force to the tooth |
| **Archwire** | The main wire that runs through all brackets; provides the sustained force that moves teeth |
| **Ligature / module** | Ties or clips that hold the archwire into the bracket slot |
| **Elastics / rubber bands** | Added by the patient; apply inter-arch force to correct the bite relationship |
| **Molar bands** | Metal rings cemented on back molars; provide anchorage for the system |
| **Coil springs** | Open or close spaces between specific teeth |

## How do clear aligners move teeth?

Clear aligners work on exactly the same biological principle. Each aligner tray is manufactured very slightly differently from the current position of the teeth — usually a fraction of a millimetre — and worn 20–22 hours per day. The pressure from the aligner is transmitted to the PDL and initiates the same bone remodelling process.

The key differences compared to fixed braces are that aligners exert forces primarily via surface contact rather than via brackets and wires, and force can only be applied when the aligner is in the mouth — which is why compliance (wearing them consistently) is critical to treatment success.

Attachments — small composite tooth-coloured bumps bonded to teeth — are often added to improve the grip the aligner has on the tooth and to allow more precise control of tooth movement, particularly for rotations and vertical movements.

## Why retention matters

Bone remodelling continues for months after braces are removed. During this period, the newly formed bone is immature and less stable, and the stretched PDL fibres on the tension side retain a 'memory' — they want to pull teeth back to where they came from. Without retainers, teeth will relapse.

The British Orthodontic Society (BOS) advises that retainers should be worn indefinitely — lifelong nightly wear — to maintain results. This is not a sign of treatment failure; it is simply because the forces that cause teeth to drift (lip pressure, tongue pressure, late jaw growth) do not stop after braces come off.

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[Clear aligner attachments](https://virtualconsultant.online/guides/clear-aligner-attachments-uk)

[Orthodontic relapse](https://virtualconsultant.online/guides/orthodontic-relapse)

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### Frequently Asked Questions

Do braces hurt?

Most patients experience some soreness for 2–5 days after braces are fitted or adjusted. This is caused by the initial force on the PDL and is a normal part of tooth movement. Over-the-counter pain relief such as paracetamol or ibuprofen (if suitable) is usually sufficient. Discomfort typically eases as teeth begin to move into their new positions.

How fast do braces move teeth?

Teeth typically move 0.5–1 mm per month under orthodontic force, though this varies by patient age, bone density, force level, and the type of movement required. Tipping (tilting) movements are faster; bodily movement (moving the whole root) and intrusion/extrusion are slower. Treatment duration ranges from 6 months for minor cases to 3+ years for complex ones.

Do clear aligners work as well as fixed braces?

Clear aligners are as effective as fixed braces for many orthodontic problems, particularly spacing, mild-to-moderate crowding, and some bite issues. Fixed braces have an advantage for complex tooth movements — such as significant vertical movement or severe rotations — because the bracket-and-wire system provides more precise three-dimensional control. A GDC-registered orthodontist can advise which is most suitable for your specific case.

Why do teeth move back after braces?

After braces are removed, the bone around the teeth is still maturing and the periodontal ligament fibres retain a 'memory' of the original position. Without retainers, the combination of PDL memory, lip pressure, tongue pressure, and ongoing jaw growth causes teeth to drift back. This is why retainer wear — ideally lifelong and nightly — is essential to maintain results.

At what age do braces work best?

Braces can work at any age, but tooth movement is typically faster in younger patients whose bone is less dense and remodelling occurs more readily. NHS orthodontic treatment is targeted at ages 10–18 when growth is active and the window of opportunity for certain movements (e.g. expansion) is widest. Adults can still achieve excellent results with braces or clear aligners, though treatment may take slightly longer.

Do braces weaken teeth?

Orthodontic treatment does not weaken healthy teeth. However, it does create slightly more areas around brackets and between teeth where plaque can accumulate, which — if oral hygiene is poor — can lead to white spot lesions (early decay) around bracket sites. Good brushing, interdental cleaning, and fluoride use during treatment protects enamel and prevents damage.

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Citation details

Title How Do Braces Work? Orthodontic Tooth Movement Explained (2026)

Publisher Virtual Consultant Online

Published 2026-05-26

Updated 2026-08-26

URL [https://staging.virtualconsultant.online/guides/how-braces-work-uk](https://staging.virtualconsultant.online/guides/how-braces-work-uk)