What dental sedation teams need to understand about capnography, oxygen saturation, and recognizing respiratory trouble before it becomes an emergency
By Duane Tinker – The Toothcop
Dental Compliance Consultant | Former Investigator
There is a number dental teams love seeing during sedation:
99%.
Patient looks good.
Pulse ox looks good.
Everybody is happy.
Except there’s a problem.
A good oxygen saturation does not necessarily mean your patient is ventilating adequately.
And if you’re providing supplemental oxygen—which the ADA’s updated guidelines address for moderate sedation through general anesthesia—that distinction becomes even more important.
This is one of those concepts that seems obvious once somebody explains it.
But I don’t think we talk about it nearly enough in dentistry.
Oxygenation and Ventilation Are Not the Same Thing
Let’s keep this simple.
Pulse oximetry tells us about oxygenation.
It estimates the percentage of hemoglobin carrying oxygen.
Capnography gives us information about ventilation.
It measures carbon dioxide in exhaled gas over time and can help us recognize changes in breathing.
Different measurements.
Different information.
Both can be important.
The mistake is assuming a normal SpO₂ means:
“The patient is breathing fine.”
It doesn’t necessarily tell you that.
Here’s Where Supplemental Oxygen Gets Interesting
Imagine you’re providing moderate sedation.
Your patient is receiving supplemental oxygen.
SpO₂:
99%.
Looks beautiful.
But the patient’s respiratory rate begins slowing.
Their tidal volume decreases.
Maybe they develop an airway obstruction.
Maybe they stop breathing.
The oxygen already in the lungs and bloodstream doesn’t instantly disappear.
So the pulse oximeter may continue displaying a reassuring number for a period of time even though ventilation has deteriorated.
That’s the problem.
If you’re watching oxygenation alone, you may be watching downstream.
Ventilation monitoring can potentially give you information earlier in that progression.
That’s one reason the distinction matters so much in sedation.
The ADA Has Changed the Conversation
The ADA’s updated sedation and anesthesia guidelines were adopted in October 2025 and released in 2026. They reflect updated, evidence-informed expectations for sedation and anesthesia safety.
And the moderate sedation section deserves attention.
For moderate sedation, the ADA says:
- oxygen saturation must be continuously evaluated by pulse oximetry;
- chest excursions must be continually observed;
- respiratory rate must be continually monitored and evaluated; and
- ventilation and/or breathing must be monitored using end-tidal CO₂ unless that monitoring is precluded or invalidated by the patient, procedure, or equipment.
The equipment necessary for monitoring end-tidal CO₂ must also be immediately available.
Read that list again.
The ADA isn’t treating pulse oximetry as a substitute for ventilation monitoring.
Neither should we.
Why Capnography Matters
Think about what we’re worried about during sedation.
A patient becomes more deeply sedated than intended.
Their respiratory drive decreases.
The tongue obstructs the airway.
Respirations become shallow.
Respiratory rate decreases.
The patient becomes apneic.
Those are ventilation problems.
Eventually they can become oxygenation problems.
And eventually an airway or respiratory emergency can become something considerably worse.
That’s why I’m increasingly interested in what I call upstream rescue.
Don’t wait for the patient to turn blue.
Don’t wait for SpO₂ to crater.
Don’t wait for bradycardia.
Don’t wait for cardiac arrest.
Recognize the respiratory problem while you still have an opportunity to correct it.
But Don’t Make the Opposite Mistake
There’s another trap here.
Buying a capnograph doesn’t make a dental office safer.
Knowing what it’s telling you might.
If you’re going to monitor end-tidal CO₂, somebody needs to understand:
What’s normal for this patient?
What does a changing respiratory rate mean?
What does a disappearing waveform mean?
Is the patient apneic?
Did the sampling line disconnect?
Is there an airway obstruction?
Is the equipment giving me bad information?
What does the clinical patient look like?
Technology doesn’t replace clinical assessment.
It gives you another source of information.
That’s why the ADA’s moderate sedation guidance doesn’t simply say “watch the capnograph.” It also calls for continual observation of chest excursion and qualitative signs of ventilation, including auscultation of breath sounds with a precordial or pretracheal stethoscope.
Monitor the patient. Not just the monitor.
“Is Capnography Required for Moderate Dental Sedation?”
This is where I need to put my compliance hat on.
Under the ADA’s 2025 moderate sedation guidelines, end-tidal CO₂ monitoring is now part of the ventilation-monitoring expectation unless precluded or invalidated by the nature of the patient, procedure, or equipment.
But that does not mean I can tell every dentist in America:
“Federal law requires capnography for moderate sedation.”
That’s not how this works.
The ADA publishes professional guidelines.
State dental boards establish enforceable requirements within their jurisdictions, and those requirements can differ.
The ADA itself notes that its updated guidelines are available to state dental boards as they determine education and competency regulations.
So the compliance question becomes:
What does your state require?
And increasingly:
How will states respond to the ADA’s updated guidelines?
I suspect we’ll be talking about that for quite some time.
What About Deep Sedation and General Anesthesia?
As sedation deepens, monitoring expectations increase.
That makes sense.
A deeply sedated patient may not be easily aroused, ventilatory function may be impaired, and the patient may require assistance maintaining a patent airway.
At that point, identifying respiratory deterioration isn’t simply about good documentation.
It’s part of rescue.
And that brings us back to something I’ve been saying throughout this series:
The best emergency may be the one you prevent.
This Should Change Our Emergency Drills
Here’s an emergency drill I’d like sedation practices to try.
Don’t start with:
“The patient is in cardiac arrest.”
Start earlier.
The patient is sedated.
Respiratory rate begins decreasing.
The capnography changes.
The patient becomes progressively less responsive.
SpO₂ is still acceptable.
Now what?
Does anyone notice?
Does somebody stimulate the patient?
Reposition the airway?
Stop administering sedative agents?
Assess breathing?
Suction?
Begin BVM ventilation when indicated?
Call for help?
That’s a much more interesting drill.
Because you’re practicing recognition and rescue before cardiac arrest.
The Toothcop’s Take
Pulse oximetry is tremendously useful.
This isn’t an argument against it.
It’s an argument against asking pulse oximetry to tell us something it wasn’t designed to tell us.
Oxygenation is not ventilation.
If you’re administering sedation capable of impairing ventilation, your team needs to understand that distinction.
Capnography can provide valuable information.
Chest excursion provides information.
Respiratory rate provides information.
Breath sounds provide information.
And the patient lying in your dental chair provides information.
Put those pieces together.
Because during sedation, I don’t want the first indication of inadequate ventilation to be a falling oxygen saturation.
I’d much rather recognize the problem before we get there.
That’s not just monitoring.
That’s rescue readiness.
Duane Tinker – The Toothcop
Clinical & Legal Disclaimer
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