Orthodontics is the dental specialty concerned with the development, position and relationship of teeth and jaws and with the diagnosis, prevention and treatment of significant abnormalities in dental alignment and bite. Orthodontic treatment commonly uses appliances to move teeth into more favourable positions and can improve crowding, spacing, protrusion and occlusion. It is not limited to cosmetic straightening because tooth position can influence oral hygiene, chewing, trauma risk and functional relationships between the jaws. NHS guidance describes Orthodontics as treatment used to straighten or move teeth and correct problems with the bite.
Tooth movement during Orthodontics occurs through controlled application of mechanical forces that alter the periodontal tissues and stimulate remodelling of the surrounding alveolar bone. Pressure and tension affect cellular and vascular processes within the periodontal ligament and adjacent bone, allowing a tooth to change position gradually rather than being physically pushed through solid bone as a rigid object. Treatment planning must therefore respect biological limits on the amount and rate of movement. Excessive or poorly controlled forces can contribute to unwanted effects, including root resorption, while inadequate control can produce inefficient movement or undesirable tooth positions.
Orthodontic appliances include fixed braces, removable appliances, clear aligner systems, retainers and, in selected complex cases, temporary anchorage devices or other specialised appliances. Fixed braces use brackets and archwires to deliver controlled forces and can provide precise three-dimensional tooth movement. Removable appliances are used for particular types of movement and developmental management, while aligner systems use a sequence of custom-made transparent trays to produce planned incremental movements. The appliance selected depends on the malocclusion, desired movements, growth status, compliance requirements, treatment objectives and clinical judgement rather than on appearance alone.
Orthodontic assessment considers tooth positions, dental arches, occlusion, jaw relationships, facial growth and relevant soft-tissue factors. Clinical photographs, study models or digital scans and radiographs may be used where appropriate. In children, timing is influenced by eruption and facial growth, while adults can generally begin treatment at any age if the teeth and supporting tissues are sufficiently healthy. NHS guidance states that treatment for children commonly starts after most adult teeth have erupted, often around age twelve, although individual development varies. Adults can also undergo treatment, but eligibility for NHS funding differs from clinical suitability.
Orthodontic treatment can improve dental alignment and bite and can make some areas easier to clean. It may reduce the risk of trauma to prominent teeth and can assist in bringing selected Impacted Teeth into the dental arch. Orthodontics can also form part of multidisciplinary treatment for cleft conditions, jaw discrepancies and complex restorative plans. In selected cases, teeth may need extraction to create space, while temporary anchorage devices can provide additional control. Treatment duration varies substantially with complexity and cooperation; NHS guidance gives a typical range of approximately six to thirty months.
Oral hygiene is a major dependency of Orthodontics. Fixed appliances create additional plaque-retentive areas and make brushing more demanding. If plaque remains around brackets, acid generated by bacteria can cause enamel demineralisation, initially producing white marks and potentially progressing to decay. Gum inflammation can also increase when cleaning is inadequate. NHS guidance therefore states that treatment should not begin unless oral hygiene is sufficiently good and emphasises additional cleaning during treatment. Orthodontic care is consequently not simply a mechanical exercise in moving teeth; it requires sustained control of the biological environment surrounding those teeth.
Retention is a fundamental part of Orthodontics because teeth have a biological tendency to move after active treatment. Retainers are used to maintain the achieved positions while surrounding tissues adapt, and many patients require long-term or indefinite retention to minimise relapse. Retainers can be removable or fixed, and adherence to the prescribed regime strongly influences stability. Other possible treatment risks include shortening of tooth roots, gum recession and loss of supporting tissues in susceptible circumstances. The risk-benefit balance therefore depends on the individual's orthodontic need, periodontal health, treatment design and ability to maintain oral hygiene and retention.
Orthodontics is often confused with purely cosmetic dentistry, but its technical scope includes occlusion, tooth eruption, dental arch relationships, facial growth and preparation for other dental procedures. Conversely, not every alignment difference requires treatment, and perfectly straight teeth are not necessarily a prerequisite for good oral health.
In the UK, NHS Orthodontics for children is generally based on clinical need, with assessment systems such as the Index of Orthodontic Treatment Need used to determine eligibility, while most adult orthodontic treatment is privately funded. Treatment should therefore be understood as an intervention with potential functional and health benefits, aesthetic benefits, biological risks and ongoing maintenance requirements rather than as an automatic requirement for anyone with crooked teeth.
