Dental and Facial
Why do I have a high palate or crowded teeth?
A high, narrow roof of the mouth and teeth that never had room to come in straight get chalked up to genetics, usually meaning "small jaw, bad luck." That's often true on its own. But this particular combination has a more specific meaning that rarely comes up outside a genetics clinic.
We're not doctors. This page reports what's actually written in the diagnostic criteria for hypermobile EDS, so you can see for yourself where this fits.
Why a High Palate Is Part of the hEDS Diagnostic Criteria
A high-arched or narrow palate occurring together with dental crowding is one of twelve specific features listed under Criterion 2A in the 2017 International EDS Consortium diagnostic criteria for hEDS, the framework clinicians use to evaluate the condition. Both features have to occur together to count as a single point toward diagnosis. This combined feature has a documented prevalence of 52.4% in people evaluated against the criteria.
This isn't a comparison borrowed from Marfan syndrome, which is a separate condition with its own diagnostic profile. The palate-and-crowding combination is a named, validated component of the hEDS diagnostic instrument itself. A 2020 systematic review of dental manifestations across EDS subtypes covers this in more detail.
Read more on the hub page
What this is worth to a diagnosis
On its own, a high palate and crowded teeth are common and mean nothing. They only carry diagnostic weight in combination with joint hypermobility and other systemic features, assessed together by someone qualified to apply the 2017 criteria. If you're already pursuing an evaluation, it's a detail worth mentioning rather than a signal to act on by itself.