How to Know Your Oral Appliance Is Actually Working

There is one structural difference between CPAP and an oral appliance that matters more than any comparison of effectiveness: CPAP tells you whether it is working, and an oral appliance does not.

A machine logs usage, leak and residual events every night. A mandibular advancement device is a piece of moulded acrylic. It has no idea what your airway is doing, and neither do you.

Why "my snoring stopped" is not enough

This is the trap, and it is the reason people spend years believing they are treated when they are not.

Snoring and apnea are related but separable. Snoring is vibration; apnea is collapse. A device can reduce the vibration substantially while leaving obstructive events in place — and because the loudest symptom has gone, everyone involved concludes it worked.

Your partner reporting a quiet night is genuine information about noise. It is not information about your apnoea-hypopnoea index, your oxygen saturation, or your arousals. Snoring versus sleep apnea.

The same logic applies to feeling better. Feeling better is worth having and is a poor proxy for treated apnea, because placebo, expectation and improved nasal breathing all produce it.

What titration means

An appliance holds your lower jaw forward. How far forward is the adjustable variable, and it is a trade-off: more advancement usually means more airway opening and more jaw discomfort.

Titration is the process of finding the position that controls your apnea at a tolerable cost. It typically runs over weeks, in small increments, which is why an appliance is not a device you fit once and forget.

Three methods exist:

Subjective titration. Advance gradually until snoring and symptoms improve and discomfort becomes the limit. Cheapest, most common, and relies on symptoms as the endpoint — with the limitation described above.

Polysomnographic titration. Adjust during an attended sleep study, measuring the effect directly.

DISE titration. Position the jaw during drug-induced sleep endoscopy while watching the airway respond. What DISE shows.

What the comparison found

A pilot randomised cross-over trial compared all three in the same patients (Sleep and Breathing, 2022).

Ten patients. That is the first thing to know, and it means everything below is preliminary.

No significant differences in targeted optimal protrusion compared with maximal comfortable protrusion across the three methods, and no significant difference in AHI reduction between them [Sleep Breath 2022].

The interesting part was predictive accuracy for identifying responders:

• Polysomnographic titration correctly classified 50% of patients as responders [Sleep Breath 2022]
• DISE titration: sensitivity 83.3%, specificity 100% [Sleep Breath 2022]

The authors' conclusion was that there were no differences in optimal mandibular positioning or corresponding efficacy between subjective, DISE and polysomnographic titration [Sleep Breath 2022].

Read carefully, that says something reassuring and something uncomfortable. Reassuring: the cheap method reached a similar jaw position and similar efficacy as the expensive ones, so subjective titration is not obviously inferior for finding the position. Uncomfortable: a PSG titration correctly identified responders only half the time, which is close to chance.

With n = 10, none of this is settled — a specificity of 100% in ten patients is a fragile number. Tier 2 at best, and the honest summary is that titration method appears less important than doing follow-up testing at all. How we grade evidence.

The step that actually matters

A repeat sleep study with the appliance in your mouth, at its final position.

This is the single most important thing on this page and the most commonly skipped. It is the only way to know whether your apnea is controlled rather than quietened. Guidelines support appliances for mild-to-moderate apnea and for patients who cannot tolerate CPAP — and the premise of that support is that efficacy gets verified, not assumed.

What to ask for:

1. A follow-up study with the device in, once titration has settled
2. Your AHI with the appliance compared against your baseline
3. Your oxygen nadir and desaturation index on treatment, not just the index
4. The supine figure specifically, since appliances often perform worst on your back

If the residual AHI with the device in is still elevated, you have a partially effective treatment — which is useful to know and is a different situation from either success or failure. Adding positional therapy is a common and sensible combination at that point. Positional therapy · How to read your sleep study.

The context worth holding

A randomised crossover trial found CPAP reduced the apnoea-hypopnoea index substantially more than an oral appliance, while the appliance was worn more hours — and blood pressure, sleepiness and quality-of-life outcomes came out similar (Phillips et al., AJRCCM, 2013).

That is the real case for appliances: worse efficacy, better adherence, comparable outcomes at moderate severity. It is a strong case. It depends entirely on the appliance actually working in you, which is why verification is not optional. CPAP versus an oral appliance.

Two other things to monitor

Bite change. Gradual tooth movement is a recognised complication of long-term use, which is why the device belongs with a dentist who has sleep-medicine training and who monitors your occlusion over time. This is the strongest argument against over-the-counter boil-and-bite mouthpieces for apnea. The tiers compared.

Whether it still fits. Acrylic wears, teeth move, and weight changes alter the airway. An appliance verified three years ago is not verified now.