A Nuanced History of Orthodontics

Every specialty writes a history that flatters it. Orthodontics tells a story of steady progress: a founder who made it a science, a lineage of refinements, and an arrival at today's evidence-based practice. It is a comforting arc, and it is achieved by leaving things out: the arguments that were lost by politics rather than evidence, the reversals, the people who did not fit the guild's picture of a pioneer, and the fact that several of the field's most basic questions were never actually settled. What follows is not a takedown. It is the fuller version: a discipline built by real, fallible individuals making testable claims, where institutional power usually decided which claim won.

Before there was a "father"

Histories of orthodontics almost always begin with Edward Angle around 1900. But the American work predates him by decades. Norman Kingsley published A Treatise on Oral Deformities in 1880, describing occlusion and jaw-repositioning ("bite-jumping") appliances years before the European functional-appliance schools formed.¹ John Nutting Farrar worked out a theory of regulated, intermittent force for moving teeth and published his two-volume treatise on irregularities in the 1880s.² Angle's own classification came later. The title "father of orthodontics" reflects who built the schools, the society, and the journal — not who thought of it first.³ That distinction matters, because the same machinery that assigns paternity is the machinery that later decided which ideas were orthodoxy.

"Old Glory": a norm built from one skull

Angle's most consequential move was to define an ideal — a single standard of "normal occlusion" that treatment should aim at. Its origin is rarely told plainly: the standard traced substantially to a particular dry skull Angle personally admired for its arrangement of teeth.⁴ The arrangement he idealized is, in the living population, uncommon — full, textbook "ideal" occlusion describes only a small minority of people, not a norm most patients could or should be forced toward. This is the recurring error the rest of this history keeps circling: a description of a population — worse, of one striking specimen within it — mistaken for a biological law binding on every individual.

What made the error durable was not evidence but infrastructure. Angle secured dozens of appliance patents, ran his own tuition schools, founded the society, and the flagship journal was edited by his loyalists.³ An idea backed by that much institutional weight does not need to be tested to prevail. It only needs to be enforced.

The extraction war, fought twice, settled neither time

The clearest case of power deciding a scientific question is the extraction debate. Angle's ideal implied that every tooth belonged in the mouth; extraction was, in his framing, mutilation. Calvin Case argued from cases that some patients could only be treated stably and healthily with extraction. At the profession's 1911 symposium the argument was, in effect, adjudicated against Case — significantly by Angle's own former students — and the dissent was then marginalized for years by an Angle-aligned editorial establishment.⁵⁶

Then the argument replayed in reverse. Charles Tweed — trained by Angle himself — followed his non-extraction cases and found many relapsed. He audited his own results, converted to extraction in a defined class of patients, and was denounced by the very establishment his teacher had built, whose leaders reportedly branded extraction-based treatment a form of "mutilation."⁷ A student's honest audit of his own failures is exactly the behavior a scientific field should reward; the field punished it.

And the question remains open. More than a century after 1911, the field's own 2023 systematic review and meta-analysis found no meaningful difference in the major outcomes between extraction and non-extraction treatment, rated most of the underlying evidence very-low-certainty, and concluded the decision is highly situational — case by case, not doctrine.⁸ A senior reviewer described the debate as still conducted "with almost religious intensity."⁹ The honest position is the individual one: what is safe and stable for this patient.

Limits versus possibilities: a buried argument

Two names survive in teaching as little more than glossary entries — a space-maintaining appliance, and a line for the lips. The argument between them is more interesting than either artifact. Hays Nance spent more than a decade following treated and untreated dentitions and published, in 1947, one of the specialty's first serious long-term studies of relapse. His conclusion was a doctrine of limitations: treated arches tend to return toward their original width once retention stops, and arch length shortens through the transition to the permanent dentition and cannot be permanently increased.¹⁰ "Leeway space" and the appliance that banks it were details inside a larger, humbling claim about what treatment can and cannot durably promise.

Robert Ricketts answered with what he explicitly branded a "possibility doctrine" — a direct rebuttal of exactly Nance's limitation-focused view.¹¹ Reduced to "the E-line," Ricketts is badly served; his real legacy is infrastructure that is still taught — the visual treatment objective for planning, and a whole-face cephalometric synthesis.¹² He deserves the two-sided portrait an honest account gives: durable methods on one hand, and on the other a specific esthetic claim he championed — facial "divine"/golden proportion — that a 2024 systematic review found unsupported.¹³ Restore both men and you recover a real question the glossary erased: what is treatment honestly allowed to claim?

The tools that made it look like science

Two instruments carry orthodontics' claim to rigor, and both deserve a careful, graded look. Cephalometric radiography, standardized by Broadbent in 1931 — and, fittingly for this history, independently by Hermann Hofrath in Germany that same year — gave the field a reproducible way to put numbers on a face.¹⁴ But reproducibility is not validity. As early as 1971, Baumrind and Frantz showed that even trained examiners locate the same landmarks with error large enough to matter, varying nearly tenfold from point to point.¹⁵ A systematic review of the whole literature judged the evidence for its usefulness uncertain, with contradictory results across studies.¹⁶ Andrews' Six Keys to Normal Occlusion (1972), still taught as finishing goals, were derived from 120 casts he judged excellent — and later work found the specific measurements do not generalize cleanly across populations.¹⁷¹⁸ The pattern is the founding error again: a population-derived average, useful as a vocabulary, mistaken for an individual biological target.

The threads written out

American, Angle-centered histories routinely drop whole lineages. The European functional-appliance tradition — Viggo Andresen and Karl Häupl's activator, later Rolf Fränkel's function regulator — developed largely in isolation from the Angle world; Fränkel worked sealed off in East Germany for roughly two decades.¹⁹ The 1970s–80s American interest in functional appliances was catch-up, not parallel discovery. In Australia, Raymond Begg studied the heavily worn dentitions of Aboriginal Australians and built a theory of crowding grounded in the interproximal attrition a coarse diet produces — an anthropological, first-principles account, not just "the light-wire technique."²⁰ The right way to honor Begg is also the way that complicates him: Corruccini's 1990 study revised the specific tooth-succession mechanism Begg proposed — a first-principles theory honestly updated under new evidence.²¹

Even the field's deep pedigree is half-myth. The flattering story of "ancient Etruscan braces" oversells a small number of gold-band appliances that were largely prosthetic — holding replacement teeth — rather than devices for moving teeth.²² Meanwhile a real non-Western contribution tends to be crowded out: the tenth-century Andalusian physician al-Zahrawi, whose surgical encyclopedia Kitab al-Tasrif is noted in later histories of dentistry for addressing the wiring of loose and irregular teeth. The pattern is worth naming: the pedigree we advertise is chosen, and the choosing tends to favor a European, guild-friendly story over a more accurate and more global one.

The breath: a careful history, and what the evidence actually says

No thread in orthodontic history is more tangled — or more abused by modern marketing — than breathing. It has to be handled in two separate registers, and this section keeps them apart: first what early figures believed (history), then what the current cross-disciplinary evidence actually supports (science, graded). Neither register is a product claim, and nothing here is a diagnosis.

The history. In 1861 the painter and traveler George Catlin published The Breath of Life (later retitled Shut Your Mouth and Save Your Life), arguing from observation that the closed-mouth, nose-breathing habits he attributed to the peoples he had painted went with straighter teeth and better health.²⁴ He was not a physician; the book was travel writing, and a period piece of "noble savage" romanticism — a contemporary reviewer called it a disorganized screed, and it tested nothing.²⁵ What is genuinely surprising is that the field's own founder embraced it: Angle credited Catlin directly, tied his own Class II description to mouth-breathing, and arranged for Catlin's book to be reprinted.²⁶ Alfred Rogers built an institutionally central career on muscle ("myofunctional") training in the same lineage. So the idea has a long pedigree in orthodontics' own founding texts. A pedigree is not proof — it is a reason to look at the evidence honestly, which is what the rest of this section does.

Settled physiology and scope. Established Nasal breathing does real physiological work that mouth breathing bypasses — warming and humidifying air, filtering particulates, generating nasal nitric oxide, and contributing roughly half of normal airway resistance.²⁷²⁸ Separately, the mechanisms that actually enlarge the jaws — growth at the sutures and at the mandibular condyle — are most active in childhood and decline sharply after puberty. That is standard craniofacial biology, and it is the simplest reason claims of reshaping a fully grown adult's face by posture do not hold.

CBCT measures shape, not sleep. Established A cone-beam scan can measure airway volume reproducibly — and that precision is exactly what misleads. Obstructive sleep apnea is a dynamic collapse during sleep, held open in waking life by neuromuscular tone; people with anatomically narrow airways can stay perfectly patent awake.²⁹ A single-timepoint volume from an upright, awake scan is a weak and inconsistent predictor of apnea, and the specialty's own position papers state that no imaging threshold has been validated for it.³⁰ A narrow airway on a picture is not a diagnosis, a risk score, or a reason to treat.

What has real support. Established When a school-age child has obstructive sleep apnea from enlarged tonsils and adenoids, confirmed by a physician's sleep study, adenotonsillectomy — a surgical, physician-led treatment, not orthodontics — is the evidence-based first-line care; the evidence is strongest in that age range and weaker for very young children or for cases judged by snoring alone.³¹³² In adults, physician-prescribed oral appliances that advance the lower jaw are a legitimate second-line option for milder disease or for people who cannot tolerate CPAP — an adjunct within physician-supervised care, monitored by a dentist for the tooth movement they can cause over years, not a cure.³³

Promising, but not proven. Preliminary Whether widening the upper jaw (maxillary expansion) meaningfully helps selected patients breathe better is an active question with encouraging but low-certainty signals — not an established effect. The famous primate experiments of the 1980s, in which totally obstructing young monkeys' noses changed their facial growth, are best read as proof of biological plausibility under extreme, artificial conditions in a small controlled cohort of experimental monkeys, never replicated at full obstruction, and with no real human analogue.³⁴

Genuinely contested. Unsettled Three of the loudest claims in this space are honestly unresolved. Does mouth-breathing cause the long, narrow "adenoid facies"? Meta-analyses find small, consistent associations,³⁵ but formal critical reviews of the same literature conclude the data do not establish causation,³⁶ and a sibling-pair study found that non-allergic, nose-breathing siblings of allergic mouth-breathers still shared an intermediate facial pattern, pointing to a familial trait rather than breathing mode as the driver.³⁷ Does jaw expansion treat pediatric apnea? Uncontrolled case series report large improvements; the controlled trials and a 2023 umbrella review do not support it as a treatment.³⁸ Does myofunctional (muscle) therapy reduce apnea severity? A Cochrane review rated the certainty low to very low.³⁹ An honest wing presents these with both directions visible and no verdict the evidence cannot bear.

The erased labor

Finally, the people the credit never reached. Anna Hopkins Angle was the founding secretary of the first orthodontic society and the first editor of the journal that still carries the family name — and she lay in an unmarked grave until 2024.⁴³ Behind nearly every appliance a clinician is credited with "inventing" stood dental-laboratory technicians who fabricated it and who appear in no history at all. A record that names its founders but not its makers is not neutral; it is a choice about whose work counts.

Why this history is the honest one

Strip the politics, the reversals, and the erasures out of orthodontic history and you get a reassuring myth of progress. Put them back and you get something more useful: a field assembled from individual, testable, often-wrong claims, in which authority and commerce frequently decided what "everyone knows" long before evidence did — and in which the core questions (does extraction help, does a cephalogram change the plan, can we truly modify growth) remain, in the field's own recent reviews, unsettled. The lesson is not cynicism. It is the working stance a careful clinician already holds: trust the individual in front of you over the population average, weigh evidence over authority, and stay humble about what a number can really tell you. First, do no harm.

1. Norman W. Kingsley (1880). A Treatise on Oral Deformities as a Branch of Mechanical Surgery. New York: D. Appleton. ↩
2. John Nutting Farrar (1888). A Treatise on the Irregularities of the Teeth and Their Corrections, Vols. I–II. New York: International News Co. ↩
3. Norman Wahl (2005–2006). Orthodontics in 3 millennia (multi-part series, incl. Chs. 1–2 and 9). American Journal of Orthodontics and Dentofacial Orthopedics, 127–129. ↩
4. C. Burke (2015). A century of influence, Part 1: Orthodontic pioneers. American Journal of Orthodontics and Dentofacial Orthopedics, 147(5 Suppl 2), S155–S160. ↩
5. L. Bernstein (1992). Edward H. Angle versus Calvin S. Case: extraction versus nonextraction. Historical revisionism, Parts I & II. American Journal of Orthodontics and Dentofacial Orthopedics, 102(5), 464–470; 102(6), 546–551. ↩
6. Calvin S. Case (1912). The question of extraction in orthodontia. Dental Cosmos, 54, 137–157 (symposium proceedings). ↩
7. Charles H. Tweed (1944). Indications for the extraction of teeth in orthodontic procedure. American Journal of Orthodontics and Oral Surgery, 30(8), 405–428. ↩
8. Elias KG, Sivamurthy G, Bearn DR (2023). Extraction vs nonextraction orthodontic treatment: a systematic review and meta-analysis. Angle Orthodontist, 94(1), 83–106. PMID 37899069. ↩
9. Sheldon Peck (2017). Extractions, retention and stability: the search for orthodontic truth. European Journal of Orthodontics, 39(2), 109–115. ↩
10. Hays N. Nance (1947). The limitations of orthodontic treatment, Parts I & II. American Journal of Orthodontics and Oral Surgery, 33(4), 177–223; 33, 225–301. ↩
11. Robert M. Ricketts (1976). Bioprogressive therapy as an answer to orthodontic needs, Parts I & II. American Journal of Orthodontics, 70(3), 241–268; 70(4). ↩
12. Robert M. Ricketts (1960). Cephalometric synthesis. American Journal of Orthodontics, 46(9), 647–673. ↩
13. Farhad B. Naini (2024). The golden ratio — dispelling the myth. Maxillofacial Plastic and Reconstructive Surgery, 46:2. PMID 38228978. ↩
14. B. Holly Broadbent (1931). A new x-ray technique and its application to orthodontia. Angle Orthodontist, 1(2), 45–66. ↩
15. Baumrind S, Frantz RC (1971). The reliability of head film measurements. 1. Landmark identification. American Journal of Orthodontics, 60(2), 111–127. PMID 5283996. ↩
16. Durão AR, Pittayapat P, Rockenbach MIB, et al. (2013). Validity of 2D lateral cephalometry in orthodontics: a systematic review. Progress in Orthodontics, 14:31. ↩
17. Lawrence F. Andrews (1972). The six keys to normal occlusion. American Journal of Orthodontics, 62(3), 296–309. PMID 4505873. ↩
18. Halim H, Halim IA, et al. (2020). The study of tooth angulation and inclination for bracket design (population generalizability of the Six Keys). Journal of the World Federation of Orthodontists, 9(4), 164–169. PMID 32952092. ↩
19. Bondevik O, Wagner OM, Berg R (1997). Viggo Andresen — a pioneer in orofacial orthopedics. Journal of Orofacial Orthopedics, 58(3), 181–183. PMID 9200894. ↩
20. P. Raymond Begg (1954). Stone Age man's dentition (four parts). American Journal of Orthodontics, 40, 298–312, 373–383, 462–475, 517–531. ↩
21. Robert S. Corruccini (1990). Australian aboriginal tooth succession, interproximal attrition, and Begg's theory. American Journal of Orthodontics and Dentofacial Orthopedics, 97(4), 349–357. PMID 2181868. ↩
22. Marshall J. Becker & Jean MacIntosh Turfa (2017). The Etruscans and the History of Dentistry: The Golden Smile through the Ages. Routledge. ↩
23. Behrents RG, et al. (2019). Obstructive sleep apnea and orthodontics: an American Association of Orthodontists White Paper. American Journal of Orthodontics and Dentofacial Orthopedics, 156(1), 13–28. PMID 31256826 (with 2026 update). ↩
24. George Catlin (1861). The Breath of Life; or, Mal-Respiration and Its Effects Upon the Enjoyments and Life of Man (reissued 1862 as Shut Your Mouth and Save Your Life). New York: John Wiley. ↩
25. L.W. Onsager (1980). That curious book "The Breath of Life" by George Catlin. International Journal of Oral Myology, 6(4), 7–10. PMID 7014487. ↩
26. Goldsmith JL, Stool SE (1994). George Catlin's concepts on mouth-breathing, as presented by Dr. Edward H. Angle. Angle Orthodontist, 64(1), 75–78. PMID 8172398. ↩
27. Kastl KG, et al. (2009). Nasal air conditioning and function. Rhinology, 47(3), 237–241. PMID 19839243. ↩
28. Jon O. Lundberg (2008). Nasal nitric oxide in man. The Anatomical Record, 291(11), 1479–1484. PMID 18951492. ↩
29. Cheng S, et al. (2014). Movement of the human upper airway during inspiration (neuromuscular patency). The Journal of Physiology, 592(21), 4763–4774. PMID 25217376. ↩
30. Taha YM, et al. (2025). CBCT upper-airway metrics as predictors of OSA: a systematic review. Dentomaxillofacial Radiology, 54(4), 245. ↩
31. Marcus CL, et al. (2013). A randomized trial of adenotonsillectomy for childhood sleep apnea (CHAT). New England Journal of Medicine, 368(25), 2366–2376. PMID 23692173. ↩
32. Venekamp RP, et al. (2015). Tonsillectomy or adenotonsillectomy versus non-surgical management for obstructive sleep-disordered breathing in children. Cochrane Database of Systematic Reviews, (10):CD011165. PMID 26465274. ↩
33. Ramar K, et al. (2015). Clinical practice guideline for the treatment of OSA with oral appliance therapy (AASM/AADSM). Journal of Clinical Sleep Medicine, 11(7), 773–827. PMID 26094920. ↩
34. Harvold EP, Tomer BS, Vargervik K, Chierici G (1981). Primate experiments on oral respiration. American Journal of Orthodontics, 79(4), 359–372. PMID 6939331. ↩
35. Zhao Z, et al. (2021). Effects of mouth breathing on facial skeletal development in children: a systematic review and meta-analysis. BMC Oral Health, 21:108. PMID 33691678. ↩
36. O'Ryan FS, Gallagher DM, LaBanc JP, Epker BN (1982). The relation between nasorespiratory function and dentofacial morphology: a review. American Journal of Orthodontics, 82(5), 403–410. PMID 6984292. ↩
37. Trask GM, Shapiro GG, Shapiro PA (1987). The effects of perennial allergic rhinitis on dental and skeletal development: a comparison of sibling pairs. American Journal of Orthodontics and Dentofacial Orthopedics, 92(4), 286–293. PMID 3477946. ↩
38. Yu M, et al. (2023). Orthodontic interventions for pediatric obstructive sleep apnea: an umbrella review. Sleep Medicine Reviews, 72:101855. PMID 37820534. ↩
39. Rueda J-R, et al. (2020). Myofunctional therapy (oropharyngeal exercises) for obstructive sleep apnoea. Cochrane Database of Systematic Reviews, 11:CD013449. PMID 33141943. ↩
40. General Dental Council (2024). Determination in the case of Michael Mew (6 Nov 2024; UK High Court appeal dismissed 15 May 2026). See also British Orthodontic Society public statement, 23 May 2025. ↩
41. U.S. Food and Drug Administration (2023). Safety Communication: risks associated with the Anterior Growth Guidance Appliance (AGGA) and similar devices (March 30, 2023). ↩
42. Sheats R, et al. (2024). Novel therapies for preventing, managing and treating obstructive sleep apnea and snoring in pediatric and adult patients (modified RAND/UCLA consensus). Journal of Dental Sleep Medicine, 11(2). DOI 10.15331/jdsm.7332. ↩
43. J.J. Zahrowski (2024). Anna Hopkins Angle: a remembrance. Angle Orthodontist, 94(3), 366–368. PMC11050459. ↩