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The research

The science behind a better night’s sleep

Oral appliance therapy isn’t a gadget or a trend. It’s backed by clinical guidelines from the American Academy of Sleep Medicine and the American Academy of Dental Sleep Medicine, randomized trials and decades of heart-health research. Here are the studies Dr. Love leans on, in plain English, with links to every source so you can dig in yourself.

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~936Madults worldwide estimated to have at least mild sleep apneaBenjafield 2019 →
34%of CPAP users don’t stick with it, a rate flat for 20 yearsRotenberg 2016 →
6.5 vs 5.2hours a night: appliance vs CPAP wear in a head-to-head trialPhillips 2013 →
~4×the odds of atrial fibrillation with severe sleep apneaMehra 2006 →

Guidelines and standards

What the AASM and AADSM recommend.

Clinical guideline · AASM + AADSM

Sleep medicine’s own guideline backs custom oral appliances.

What they found. The American Academy of Sleep Medicine and the American Academy of Dental Sleep Medicine reviewed the evidence together. They recommend an oral appliance over no treatment for adults with obstructive sleep apnea who can’t tolerate CPAP or prefer another option, and over no treatment for snoring. They recommend a custom, adjustable appliance made by a qualified dentist over store-bought devices, plus a follow-up sleep test to confirm it’s working.

What it means for you. This is the playbook Dr. Love follows: a physician’s diagnosis, a custom titratable appliance, and a follow-up test.

Ramar K, Dort LC, Katz SG, et al. Clinical practice guideline for the treatment of obstructive sleep apnea and snoring with oral appliance therapy: an update for 2015. J Clin Sleep Med. 2015;11(7):773–827.

Free full text ↗PubMed ↗DOI ↗

Standards of care · AADSM 2025

The newest AADSM standards: appliances work for mild, moderate and severe sleep apnea.

What they found. The AADSM’s 2025 standards update says oral appliances can be a first-line treatment for snoring and for sleep apnea, and are appropriate across mild, moderate and severe cases, including for people who couldn’t tolerate CPAP or would rather not use it. It calls for custom, adjustable, FDA-cleared appliances, close teamwork between dentist and physician, and check-ups every six months in the first year.

What it means for you. A sleep dentist and your physician should work as one team, and you should be seen regularly after the appliance is fitted.

Levine M, Cantwell MK, Postol K, Schwartz DB. Dental sleep medicine standards for screening, treatment, and management of sleep-related breathing disorders in adults using oral appliance therapy: an update. J Dent Sleep Med. 2025;12(2).

Read the standards (PDF) ↗Patient fact sheet (PDF) ↗DOI ↗

Definition · AADSM

What makes an appliance “effective”? The AADSM spelled it out.

What they found. An AADSM panel defined an effective sleep apnea appliance: custom-made from scans or impressions of your mouth, engaging both upper and lower teeth, and able to move the lower jaw forward in steps of a millimeter or less across at least 5 millimeters of range. It should be reversible, hold its setting through the night, be easy for the patient to put in and take out, and last at least three years.

What it means for you. A boil-and-bite mouthguard isn’t the same thing. Dr. Love’s appliances are custom-milled and adjusted in fine steps.

Scherr SC, Dort LC, Almeida FR, et al. Definition of an effective oral appliance for the treatment of obstructive sleep apnea and snoring: a report of the American Academy of Dental Sleep Medicine. J Dent Sleep Med. 2014;1(1):39–50.

Read the article ↗DOI ↗

Appliance vs. CPAP

How the two compare on health outcomes.

Randomized trial · CPAP vs appliance

Head to head, an appliance matched CPAP on health outcomes.

What they found. 126 people with moderate to severe sleep apnea tried a month of CPAP and a month of a custom appliance, in random order. CPAP lowered breathing events more, but people wore the appliance longer each night (about 6.5 hours vs. 5.2 for CPAP). After a month, blood pressure and other health measures came out similar, and the authors suggest the extra hours of wear made up for the difference in strength.

What it means for you. The treatment you actually wear all night can do as much good as a stronger one you take off at 2 a.m.

Phillips CL, Grunstein RR, Darendeliler MA, et al. Health outcomes of continuous positive airway pressure versus oral appliance treatment for obstructive sleep apnea: a randomized controlled trial. Am J Respir Crit Care Med. 2013;187(8):879–887.

PubMed ↗DOI ↗

Meta-analysis · JAMA

Both CPAP and oral appliances were linked to lower blood pressure.

What they found. Researchers pooled 51 randomized trials with nearly 4,900 patients. Compared with no treatment, CPAP and mandibular advancement appliances were each associated with a drop in blood pressure of roughly 2 mm Hg, and the analysis found no statistically significant difference between the two.

What it means for you. Treating sleep apnea is good for your heart, and an appliance is a real option for getting there.

Bratton DJ, Gaisl T, Wons AM, Kohler M. CPAP vs mandibular advancement devices and blood pressure in patients with obstructive sleep apnea: a systematic review and meta-analysis. JAMA. 2015.

PubMed ↗DOI ↗

Actually wearing it

Why nightly use matters as much as strength.

Objective wear-time study · Thorax

A tiny sensor proved people really do wear their appliance.

What they found. Researchers embedded a temperature microsensor in 51 patients’ appliances to measure real wear time, not just what patients reported. Over three months, patients averaged about 6.6 hours a night, roughly 8 in 10 were regular users, and what patients said matched what the sensor recorded.

What it means for you. Appliance comfort isn’t a sales line. It shows up in the hours people actually sleep with it.

Vanderveken OM, Dieltjens M, Wouters K, et al. Objective measurement of compliance during oral appliance therapy for sleep-disordered breathing. Thorax. 2013;68(1):91.

Thorax ↗DOI ↗

20-year review · CPAP adherence

About a third of CPAP users don’t stick with it, and that hasn’t changed in 20 years.

What they found. A review of 82 studies published from 1994 to 2015 found an overall CPAP non-adherence rate of about 34% and no meaningful improvement over two decades.

What it means for you. If CPAP hasn’t worked for you, you’re far from alone, and it’s exactly why an alternative matters.

Rotenberg BW, et al. Trends in CPAP adherence over twenty years of data collection: a flattened curve. J Otolaryngol Head Neck Surg. 2016;45(1):43.

PubMed ↗DOI ↗

Consensus paper · AADSM

The AADSM defined what “wearing it enough” means.

What they found. An AADSM task force proposed a clear target: wear the appliance for at least 80% of your sleep, at least five nights a week. It found self-reports and sensors broadly agree, and cites studies where wear time ran above 85% of sleep time. Patients who can’t meet the target should go back to their physician to look at other options.

What it means for you. We track how you’re doing with it, and loop in your physician if it isn’t working for you.

Radmand R, Chiang H, Di Giosia M, et al. Defining and measuring compliance with oral appliance therapy. J Dent Sleep Med. 2021;8(3).

Read the paper (PDF) ↗DOI ↗

Why treat sleep apnea

What’s at stake if it goes untreated.

Global estimate · Lancet Respiratory Medicine

Close to a billion adults worldwide may have sleep apnea.

What they found. Pooling published prevalence studies and applying the AASM’s diagnostic criteria, researchers estimated about 936 million adults aged 30 to 69 have at least mild obstructive sleep apnea, and about 425 million have moderate to severe sleep apnea.

What it means for you. Snoring and daytime exhaustion are common, and most people who have sleep apnea don’t know it yet.

Benjafield AV, Ayas NT, Eastwood PR, et al. Estimation of the global prevalence and burden of obstructive sleep apnoea: a literature-based analysis. Lancet Respir Med. 2019;7(8):687–698.

PubMed ↗

Sleep Heart Health Study

Untreated sleep apnea is tied to heart failure, stroke and heart disease.

What they found. In a large national study of middle-aged and older adults, people with the most breathing disruptions during sleep had about 2.4 times the odds of heart failure, about 1.6 times the odds of stroke and about 1.3 times the odds of coronary heart disease, compared with people with the fewest.

What it means for you. These are the figures behind the heart-risk numbers on our home page.

Shahar E, Whitney CW, Redline S, et al. Sleep-disordered breathing and cardiovascular disease: cross-sectional results of the Sleep Heart Health Study. Am J Respir Crit Care Med. 2001.

PubMed ↗

Sleep Heart Health Study

Severe sleep apnea came with about 4 times the odds of atrial fibrillation.

What they found. In the same national study, people with severe sleep-disordered breathing had about four times the odds of atrial fibrillation and about three times the odds of nonsustained ventricular tachycardia during the night, after adjusting for age, sex, weight and heart disease.

What it means for you. Irregular heart rhythms at night are one more reason not to shrug off loud snoring and pauses in breathing.

Mehra R, Benjamin EJ, Shahar E, et al. Association of nocturnal arrhythmias with sleep-disordered breathing: the Sleep Heart Health Study. Am J Respir Crit Care Med. 2006;173(8):910–916.

PubMed ↗DOI ↗

The honest version

CPAP lowers breathing events more than an appliance does, and it remains the go-to for many people with severe sleep apnea. The studies above show why that isn’t the whole story: a treatment only works on the nights you wear it. Your diagnosis comes from a physician, and a follow-up sleep test with the appliance in place tells you how well it’s working for you.

This page is educational and isn’t a diagnosis or medical advice. Summaries are ours; follow the links for each study’s full findings.

For physicians

Referring a CPAP-intolerant patient? Dr. Love follows the AASM/AADSM guideline: custom titratable appliances, and consult summaries back to you.

Referral details

See what the research looks like on you.

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