As you drift into sleep, your body lets go. Large muscle groups relax first, then smaller ones. That tension you’ve been carrying in your shoulders releases. As sleep deepens, the tension in your face and neck release, too. So do the muscles that hold your lower jaw in place.
And for some, that natural backward drift of the lower jaw narrows or even obstructs the airway just enough to set off the cycle of interrupted breathing, fragmented sleep, and reduced oxygen that signals obstructive sleep apnea (OSA). This can become more than a nighttime variable. It can become the main driver of the problem.
In such cases, treatment with an oral appliance called a mandibular advancement device (MAD) can be very effective. Custom-fitted to each patient, a MAD gently repositions the lower jaw — the mandible — forward during sleep, keeping the airway open. Most patients prefer the comfort and convenience of this small device over CPAP, making MADs one of the most important tools we have for treating OSA
And that brings us to a really interesting review published last year in the Journal of Clinical Sleep Medicine.
As its authors note, most studies of MADs have been done
in primarily White populations. However, East Asians have restrictive craniofacial features, such as a reduced cranial base, maxilla, and retropalatal space, which may affect their response to treatment.
So they analyzed data from 12 studies involving 382 East Asian patients with sleep apnea and found that, overall, those who used MADs slept better, had fewer apnea events, maintained healthier oxygen levels through the night, and woke up feeling more rested.
In fact, MAD users showed a mean reduction in apnea-hypopnea index — AHI, which is a measure of how many times per hour that breathing is interrupted during sleep — of 19.1. That’s enough of a drop to move someone from moderate OSA to mild; even into territory below the threshold for a sleep apnea diagnosis.
As the quote above suggests, anatomy is why this type of therapy works so well for patients of East Asian descent in particular, many of whom don’t fit the standard apnea profile (obese, thick neck, etc.)..
Rather than OSA being linked with overweight or obesity, apnea in East Asian populations arises mainly from skeletal structure. These patients tend to have a shorter cranial base, a less prominent maxilla (upper jaw), and a mandible that sits further back than is typical in Caucasian patients. The airway is narrow at the bone level, not from excess soft tissue.
As a 2025 paper on the global burden of OSA put it,
Contrary to the assumption in previous research that OSA prevalence primarily correlates with obesity prevalence, our analysis emphasizes the critical role of demographic and craniofacial variations, particularly in Asian populations, indicating the necessity of more nuanced and culturally sensitive diagnostic and management strategies.
When excess tissue is the problem, treatments that address that make sense. But when the jaw itself is sitting in a position that narrows the airway, the most logical thing is to address the jaw directly. That’s exactly what mandibular advancement does.
Yet because so many East Asian patients don’t fit the “standard” sleep apnea profile, they’re also less likely to be screened, less likely to be diagnosed, and much more likely to be living with a condition that can be literally life-threatening. (With severe OSA, your risk of dying from any cause more than doubles.)
What’s more, research suggests that Asian patients may start to experience heart and metabolic issues, including type 2 diabetes, at lower levels of apnea severity than Western-calibrated standards would predict.
These facts make it all the more important for patients of East Asian descent to look into getting screened for OSA if you’ve never had it done — especially if you snore, wake up tired, or have a partner who’s noticed you struggling to breathe while you sleep.
And if you already have a diagnosis — whatever your background — and haven’t yet explored oral appliance therapy or find CPAP hard to live with, we invite you to consult with Dr. Abdulla here in our Laguna Hills office. MADs work well for many types of patients and many types of apnea. The craniofacial picture we’ve described here is one reason they work especially well for East Asian patients.
The jaw is involved in OSA more broadly than most people realize. Which means that for a lot of people, addressing it directly turns out to be exactly the right move.