Orthodontics is the dental specialty focused on diagnosing, preventing, and correcting misaligned teeth and jaws. It’s one of nine recognized specialties in dentistry, and it goes well beyond straightening crooked teeth. Orthodontists work with the entire relationship between your upper jaw, lower jaw, and how your teeth fit together when you bite down.
What Orthodontists Actually Do
The core problem orthodontics addresses is malocclusion, which is the clinical term for a “bad bite.” This covers a wide range of issues: teeth that are crowded or spaced too far apart, jaws that don’t line up properly, and bites where the upper and lower teeth don’t meet the way they should. Orthodontists use controlled forces to reposition teeth through bone remodeling and, in younger patients, guide facial growth while the jaw is still developing.
Common conditions treated include overbites (where upper teeth overlap the lower teeth too much vertically), underbites (where lower front teeth sit in front of the upper teeth), and crossbites (where upper teeth fit inside the lower teeth when the mouth closes). Crowding, which happens when teeth are too large for the available jaw space, is one of the most frequent reasons people seek treatment.
How Teeth Actually Move
When braces or aligners apply force to a tooth, that pressure travels through a thin layer of tissue called the periodontal ligament, which connects the tooth root to the surrounding bone. The force compresses the ligament on one side and stretches it on the other, triggering a biological chain reaction.
On the compressed side, the body activates specialized cells that break down bone, creating space for the tooth to shift into. On the stretched side, different cells build new bone to fill the gap left behind. This simultaneous process of breaking down and rebuilding bone is what allows teeth to move gradually without damaging the jaw. It’s also why orthodontic treatment takes months rather than weeks: the bone needs time to remodel safely around each small adjustment.
Types of Orthodontic Appliances
Orthodontic devices fall into three broad categories: fixed, removable, and hybrid.
- Traditional metal braces use brackets bonded to each tooth, connected by a wire that applies steady pressure. Modern versions use self-ligating brackets that reduce friction and can shorten adjustment appointments.
- Clear aligners are removable plastic trays, custom-molded to your teeth, that you swap out every one to two weeks as your teeth shift. They became widely available starting in 1999 and have grown popular for their appearance and the ease of maintaining oral hygiene during treatment.
- Palatal expanders and other functional appliances work on the jaw itself rather than individual teeth. These are most effective in children and adolescents whose bones are still growing.
Fixed appliances like braces demand more attention to oral hygiene because food can collect around brackets and wires. Removable aligners simplify brushing and flossing but require discipline: they only work if you wear them for the recommended hours each day.
How Long Treatment Takes
The average course of fixed orthodontic treatment runs about 18 to 19 months, though individual timelines vary considerably. Several factors push that number higher or lower. Cases that require tooth extractions to relieve severe crowding tend to take longer, averaging close to 20 months compared to roughly 17.5 months for non-extraction plans. Missed appointments and broken brackets also add time. In one university study, patients who missed more than one appointment had significantly longer treatment durations than those who kept their schedule.
Age, gender, and the severity of the initial bite problem all play a role too. Men in the same study averaged slightly longer treatment times than women. The bottom line: showing up to your appointments and taking care of your appliances are two of the most controllable factors in finishing on time.
The Retention Phase
Once braces come off or you finish your last aligner tray, treatment isn’t truly over. Teeth have a natural tendency to drift back toward their original positions, so nearly every orthodontic patient needs a retainer. Retention can involve a removable retainer worn for several hours daily or a thin wire bonded to the back of the front teeth permanently.
Patients in long-term studies report that wearing removable retainers can feel inconvenient, particularly the daily time commitment and the minor speech effects that come with them. But skipping retention is the most common reason orthodontic results don’t last.
Benefits Beyond a Straighter Smile
The cosmetic improvement is obvious, but properly aligned teeth also change how your mouth functions day to day. Patients report better chewing ability after treatment, with some noting they shifted from chewing on one dominant side to comfortably using both. Teeth that fit together correctly distribute biting forces more evenly, which reduces wear and strain on individual teeth.
Aligned teeth are also easier to clean. Crowded or overlapping teeth create tight spaces where plaque builds up, raising the risk of cavities and gum disease. Multiple long-term follow-up studies found that patients perceived a real reduction in dental problems years after treatment. Beyond the physical changes, improved self-confidence and more comfortable social interactions are consistently reported as major outcomes, sometimes more meaningful to patients than the functional gains.
Orthodontist vs. General Dentist
All orthodontists are dentists, but not all dentists are orthodontists. After completing four years of dental school, orthodontists enter an additional two to three years of full-time residency training focused exclusively on tooth movement, jaw relationships, and facial growth. This extra 24 to 36 months covers the biomechanics of how teeth and bone respond to force, which is knowledge general dentists aren’t trained in to the same depth.
General dentists can legally provide some orthodontic treatments, particularly clear aligners for mild cases. For complex bite problems, jaw discrepancies, or treatment in growing children, an orthodontist’s specialized training becomes more important.
When to Start
The American Association of Orthodontists recommends that every child be screened by an orthodontist by age 7. That sounds early, but by that age most children have enough permanent teeth for a specialist to spot developing problems with jaw alignment or tooth spacing. An early evaluation doesn’t necessarily mean early treatment. In many cases, the orthodontist simply monitors growth over time and begins treatment later when it will be most effective. Catching certain jaw issues early, though, can reduce the need for more invasive or expensive corrections later.
Adults make up a growing share of orthodontic patients. There’s no biological age limit for moving teeth, since the bone remodeling process works at any age. Treatment in adults may take slightly longer because adult bone is denser, but the outcomes are comparable.
How Technology Has Changed the Field
Digital tools have reshaped how orthodontists plan and monitor treatment. Intraoral scanners now create detailed 3D models of your teeth in minutes, replacing the messy putty impressions many people remember. These digital models are more accurate than traditional plaster casts, and one recent comparison found that AI-assisted 3D scanning reduced the time needed for dental measurements by over 60%.
Treatment planning software uses those scans alongside X-rays and photos to simulate how your teeth will move at each stage, so you can preview the expected result before treatment begins. Cone beam CT imaging gives orthodontists a full three-dimensional view of the teeth, roots, and surrounding bone, something a standard dental X-ray can’t provide. These advances allow for more personalized treatment plans based on your specific anatomy rather than generalized protocols.