What the score means
This isn't a medical diagnosis. It's a pattern-matching tool against the most common symptoms of habitual nighttime mouth breathing. People who score high almost always benefit from a closed-mouth sleep intervention; people who score low may still benefit (mouth breathing is sneaky) but with less certainty.
For the why-this-matters explanation: the complete guide to nasal breathing covers the physiology, the research, and the protocol.
For the brand-by-brand mouth tape comparison: we tested 12 brands.
If you have diagnosed sleep apnea
This self-screen isn't a substitute for a sleep study. If you've been diagnosed with moderate or severe obstructive sleep apnea (AHI > 15), don't replace CPAP with mouth tape based on this quiz. Talk to your sleep physician. More on when mouth tape works vs when CPAP is required.