A claim you hear on longevity podcasts

Does CPAP work better than a mouth guard for sleep apnea?

Strong consensus for. Of 10 studies that test it, 7 agree and 3 partly agree.

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The claim checked: CPAP lowers breathing pauses and raises oxygen more than a mouth guard Hear it at 15:51

What do the studies say?

Strong consensus for

The apnea-hypopnea index (AHI) counts breathing pauses per hour of sleep. Seven of ten studies agree that CPAP lowers it more than a mouth guard that moves the lower jaw forward. A Cochrane pooled analysis, which adds up many smaller trials, found 7.97 fewer events an hour with CPAP and higher minimum oxygen. Another pooled 13 trials and found a gap of 7.03 events. Three studies partly agree: one calls its evidence very low quality, and two small ones tested people who could not stay on CPAP. These compare the machines at their best, not how many hours people keep them on.

Computed from 10 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.

What was said on the podcast?

“Although CPAP generally reduces the apnea hypopnea index or AHI, improves oxygenation more effectively than the bite or mouth guard does.”
Mark Hyman, The Doctor's Farmacy · Sleep Apnea: Why CPAP Isn't Fixing the Real Problem (This Does!) · 15:51 on YouTube
Episode check Treating sleep apnea can bring weight loss without trying, the episode says. Nine of ten studies disagree. 6 claims checked against 68 studies · 5 chapters not checked yet See the whole episode →
The point checked Strong consensus for

CPAP generally reduces the apnea-hypopnea index and improves oxygenation more than a mandibular advancement device

Agree 7

pooled analysis · 2006

“Compared with oral appliances, CPAP significantly reduced the apnoea and hypopnoea index (crossover studies: ‐7.97 events/hr, 95% CI ‐9.56 to ‐6.38) and improved sleep efficiency (crossover studies: 2.31%, 95% CI 0.02 to 4.6) and minimum oxygen saturation (4.14%, 95% CI 3.25 to 5.03).”

Continuous positive airways pressure for obstructive sleep apnoea in adults. Cochrane Database Syst Rev
Who: Adults with obstructive sleep apnoea (apnoea and hypopnoea index greater than five per hour) in randomised trials
PMID 16855960

pooled analysis · 2016

“From 13 trials (746 patients) the estimated overall difference in AHI was 7.03 events/hour (95%CI 5.41, 8.66), p < 0.001, with CPAP having lower post-treatment AHI than MAD (see Fig. 3 ).”

Meta-analysis of randomised controlled trials of oral mandibular advancement devices and continuous positive airway pressure for obstructive sleep apnoea-hypopnoea. Sleep Med Rev
Who: RCTs of adults (16 y or older) with OSAH of any severity; samples 65%-100% men, mean ages 44.0-59.2 y, mean BMI 28.3-35.1 kg/m2
PMID 26163056

controlled trial · 2013

“However, CPAP was more effective in lowering the AHI and showed higher oxyhemoglobin saturation levels compared with oral appliance therapy.”

Oral appliance versus continuous positive airway pressure in obstructive sleep apnea syndrome: a 2-year follow-up. Sleep
Who: 103 previously untreated patients over 20 with mild to severe OSAS (AHI >=5) in Groningen, the Netherlands
PMID 23997361

controlled trial · 2014

“Effect difference between CPAP and MADs was 7.0/hour (p < 0.001), favouring CPAP.”

Clinical effectiveness and cost-effectiveness results from the randomised controlled Trial of Oral Mandibular Advancement Devices for Obstructive sleep apnoea-hypopnoea (TOMADO) and long-term economic analysis of oral devices and continuous positive airway pressure. Health Technol Assess
Who: Adults with OSAH: TOMADO trial of 90 adults with mild to moderate OSAH, plus trial-level meta-analysis in mostly overweight or obese middle-aged men
PMID 25359435

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controlled trial · 2025

“The improvement in REI and ODI from baseline to post-treatment was statistically significantly higher in the CPAP group than the MAS group (REI 10.4 (95% CI 7.8–13.0) events·h −1 and ODI 9.8 (95% CI 7.3–12.2) events·h −1 per intention-to-treat analysis) ( table 4 ).”

Continuous positive airway pressure and mandibular advancement splints: the CHOICE multicentre, open-label randomised clinical trial. Eur Respir J
Who: Treatment-naive adults aged 19-75 with OSA and BMI of 35 or less from Canadian sleep clinics; mean age 52.3, 58 men and 21 women
PMID 39638418

pooled analysis · 2017

“As a result of the analysis, a more significant decrease in AHI was observed in patients treated with N-CPAP.”

Mandibular advancement devices vs nasal-continuous positive airway pressure in the treatment of obstructive sleep apnoea. Systematic review and meta-analysis. Med Oral Patol Oral Cir Bucal
Who: Previously untreated patients with mild to severe OSA in randomised trials (4 crossover, 2 parallel) comparing N-CPAP with mandibular advancement devices
PMID 28578372

systematic review · 2026

“CPAP remains the most effective therapy for reducing the AHI and improving oxygen saturation in moderate to severe OSA, but adherence issues limit its long‐term use.”

Comparative Efficacy of Continuous Positive Airway Pressure and Mandibular Advancement Devices in the Treatment of Obstructive Sleep Apnea: A Systematic Review. J Sleep Res
Who: OSA patients in randomised clinical trials comparing CPAP and MAD, mild to severe disease; listed trial samples range from 29 to 220 patients
PMID 40921722

Partly agree 3

pooled analysis · 2022

“Continuous positive air pressure significantly reduces AHI in obstructive sleep apnea patients, but quality of evidence is very low in comparison to MAD.”

To compare different non-surgical treatment modalities on treatment of obstructive sleep apnea: A systematic review and meta-analysis. J Indian Prosthodont Soc
Who: Patients with OSA in randomized and crossover trials; authors apply results to mild-to-moderate OSA, age range 24 to 55 years
PMID 36511065

other primary study · 2020

“Although it is almost unknown 24 to what extent the design of an OA m impacts its efficacy, the present study shows that, compared to CPAP tritation, the DIORS ® may be a good alternative to CPAP non-adherent patients ( Table 2 ), providing significant objective and subjective improvements.”

A singular oral appliance to treat obstructive sleep apnea in CPAP non-adherent patients. Dental Press J Orthod
Who: Adults with mild to severe OSA who were non-adherent to CPAP (11 men, 9 women; mean age 51.9 years; mean BMI 28.58), each assessed at baseline, on CPAP titration and on the DIORS oral appliance
PMID 33206828

controlled trial · 2026

“A statistically significant difference was observed only for SpO₂ (p = 0.003), with CPAP demonstrating a slightly greater median increase.”

Effectiveness of a fully digital mandibular advancement appliance compared with CPAP in the treatment of obstructive sleep apnea. Dental Press J Orthod
Who: 20 adults aged 40-70 with OSA (AHI <50, BMI <=35), intolerant of or nonadherent to CPAP; 14 men, 6 women, mean age 54.85
PMID 42879578

Disagree 0· none of the studies we read

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