How Orthodontic Treatment Works

Orthodontics moves teeth by exploiting a remarkable biological property: bone is living tissue that responds to sustained pressure. Apply gentle, continuous force to a tooth, and the bone on the pressure side slowly resorbs (breaks down) while new bone forms on the tension side. The tooth moves through what was bone. This is the fundamental mechanism behind every orthodontic appliance — braces, aligners, retainers, and expanders.

The Biology of Tooth Movement

Each tooth sits in a socket, suspended by a ligament (the periodontal ligament, or PDL) that acts like a microscopic hammock of fibers. When sustained force is applied, the PDL on the pressure side compresses; the PDL on the tension side stretches. The compressed side stimulates osteoclasts (bone-dissolving cells); the stretched side stimulates osteoblasts (bone-forming cells). Over weeks, the tooth has moved and the bone has remodeled around it. Remove the force too early and the tooth tends to drift back — which is why retention is essential.

What Orthodontics Can Fix

• Crowding: Teeth overlapping due to insufficient arch space
• Spacing: Gaps between teeth
• Overbite: Upper front teeth overlapping lower front teeth too much vertically
• Underbite: Lower teeth in front of upper teeth
• Crossbite: Some upper teeth biting inside lower teeth
• Open bite: Front teeth don't meet when back teeth are together
• Midline discrepancy: Upper and lower dental midlines don't align

The Treatment Timeline

Orthodontic treatment for most cases takes 12–36 months depending on severity and patient age (younger patients often move teeth faster because bone remodels more quickly). Appointments are typically every 6–8 weeks for adjustments. After active treatment, a retention phase begins — critical for maintaining results permanently.

Beyond Aesthetics

Orthodontic treatment improves more than appearance. Properly aligned teeth are easier to clean (reducing cavity and gum disease risk), distribute biting forces more evenly (protecting teeth from excessive wear), and can improve jaw function and reduce TMJ-related discomfort in certain cases.