Orthodontic treatment is necessary because misaligned teeth create measurable problems for your oral health, your ability to chew and speak, and your confidence in social situations. It’s not purely cosmetic. Crooked or crowded teeth are harder to clean, put uneven stress on your jaw, and can interfere with how you pronounce certain sounds. The specific reasons vary from person to person, but the core issue is the same: when teeth don’t fit together properly, the consequences compound over time.
Crowded Teeth Raise Your Risk of Gum Disease
The most direct health reason for orthodontic treatment is that misaligned teeth are significantly harder to keep clean. When teeth overlap or crowd together, toothbrush bristles and floss can’t reach the surfaces between them effectively. Plaque builds up in those gaps, and plaque leads to inflamed gums.
A meta-analysis in the Journal of Clinical Medicine found that children with malocclusion had 66% higher odds of developing gingivitis compared to children with properly aligned teeth. Children with well-aligned teeth in a normal bite were 34% less affected by gum inflammation than those with crooked or spaced teeth. The numbers get more striking with more severe crowding: individuals with crowding greater than 4 mm were 99% more likely to have poor oral hygiene. And children without proper spacing between their upper front teeth had a 90% higher probability of gingivitis.
Gingivitis is reversible, but when it progresses to periodontitis, you start losing the bone that holds teeth in place. That’s permanent. Straightening crowded teeth removes hiding spots for bacteria, making your daily brushing and flossing routine far more effective at preventing gum disease before it starts.
Impacted Teeth Can Damage Their Neighbors
Sometimes teeth don’t erupt into the mouth at all, or they come in at the wrong angle. Upper canines are a common culprit. When a tooth stays trapped in the bone or pushes against adjacent teeth, the consequences can include root resorption (where the roots of neighboring teeth slowly dissolve), cyst formation around the impacted tooth, infection, loss of arch space as other teeth drift into the gap, and referred pain that can be hard to diagnose.
About 0.71% of children between ages 10 and 13 already show resorption of their permanent incisors caused by an ectopic upper canine. That percentage sounds small, but the damage is irreversible. Without orthodontic intervention to guide the impacted tooth into position or manage the space, the long-term outlook is poor. Baby canines left in place as substitutes will eventually lose their roots and need extraction, leaving a gap that’s harder to restore the longer you wait.
Your Bite Affects How Well You Chew
Chewing is the first stage of digestion. Your teeth physically break food into smaller particles so enzymes in your stomach and intestines can do their work. When your upper and lower teeth don’t meet properly, you lose grinding surface area, and that directly reduces how well you process food.
A systematic review in The Angle Orthodontist confirmed that malocclusions cause decreased chewing performance, particularly when there’s a reduced area of contact between upper and lower teeth. People with fewer contact points between their jaws simply can’t break food down to the same particle size in the same number of chewing strokes as people with a well-aligned bite. You may compensate by chewing longer, choosing softer foods, or swallowing larger pieces, but none of those are ideal solutions. Orthodontic treatment restores the platform your teeth need to grind food efficiently.
Misalignment Changes How You Speak
Your teeth, lips, and tongue work together to produce specific sounds. When teeth are out of position, certain phonemes become harder to articulate correctly. The sounds most frequently affected are “s,” “r,” “z,” “f,” and “ch,” all of which depend on precise airflow between or around the teeth.
Research published in The Angle Orthodortist found strong, specific links between bite problems and speech errors. An anterior open bite (where the front teeth don’t touch when the mouth is closed) was significantly associated with difficulty producing “s,” “z,” “ch,” and “f” sounds, because there’s no seal between the front teeth to direct airflow correctly. A deep overbite or excessive overjet made “f,” “ch,” “p,” “b,” “t,” and “d” sounds harder, since the lower lip can’t reach the right position against the upper teeth. Crossbites were linked to problems with “z,” “s,” and “f.” Even the rolling “r” sound was affected by both Class II and Class III jaw relationships.
Speech therapy can help compensate for some of these issues, but it’s working against the physical structure of the mouth. Correcting the alignment removes the structural barrier, often making speech improvements faster and more lasting.
Self-Esteem and Social Confidence
The psychological impact of crooked teeth is real and measurable. A study tracking adult orthodontic patients found that 70.6% experienced meaningful improvement in self-esteem after treatment, while only 16.7% reported any decline. Before treatment, about 57% of patients rated their self-esteem positively on specific questions. After treatment, that number jumped to 97%. Self-confidence scores followed a nearly identical pattern, rising from about 61% to 96%.
The social effects were just as clear. Among patients who initially reported poor social acceptance, nearly 82% said it improved after orthodontic treatment. Of those who felt they had difficulty in relationships with other people, 80% reported improvement. These aren’t just feelings about appearance. How comfortable you are smiling, talking, and being seen affects job interviews, friendships, dating, and everyday interactions in ways that accumulate over years.
When To Start and How Long It Takes
The American Association of Orthodontists recommends that every child have their first orthodontic evaluation by age 7. This doesn’t mean treatment starts at 7 for most kids. It means that by age 7, enough permanent teeth have come in for an orthodontist to spot developing problems like crossbites, severe crowding, or impacted teeth early enough to intervene simply, sometimes avoiding more complex treatment later.
For standard treatment with braces, the average duration is about 20 months, though this varies widely. Straightforward cases can wrap up in 14 months, while complex cases routinely stretch to 30 months or longer. Several factors push that timeline in either direction:
- Severity of the problem. More complex cases (scored above 15 on the discrepancy index used by orthodontists) averaged 30 months, compared to 22 months for simpler cases.
- Extractions. Removing two premolars added roughly 3 months on average. Four extractions added about 4 months.
- Class II bite correction. Fixing an overbite where the lower jaw sits too far back typically adds 5 to 7 months compared to treating a standard case.
- Jaw surgery cases. When orthodontics is combined with surgical correction, total treatment runs 18 to 36 months, with most of that time in the pre-surgical braces phase.
- Patient cooperation. Each missed appointment adds about a month. Not wearing elastics as directed adds roughly 1.4 months. Poor oral hygiene adds about 0.7 months. Every broken bracket adds 0.6 months.
More experienced orthodontists also tend to finish cases faster, and certain techniques, like using interproximal reduction (shaving tiny amounts between teeth) instead of extractions in borderline cases, can shorten treatment by as much as 8 months.
Adults Benefit Just as Much
Orthodontic treatment isn’t just for teenagers. The health risks of misaligned teeth don’t stop accumulating at age 18. Adults face the same increased risk of gum disease from crowding, the same chewing limitations from a poor bite, and the same speech patterns shaped by tooth position. The self-esteem data cited above came specifically from adult patients, showing that the psychological benefits are just as significant when treatment happens later in life. Treatment may take slightly longer in adults because bone remodels more slowly, but the outcomes are comparable.