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"Teeth rendered but not visible" is just saying "missing lods and lack of culling" in a rhetorically more effective way. I don't think anybody thinks it's the teeth specifically causing the perf issues, they're merely a concrete example.

> Missing LODs and lack of culling

That is the exact start of the sentence of which you quoted the end of:

> Mesh Shaders in this case enable a lot of really smart culling and dynamic level of detail

The article you linked specifically points out how expensive and unoptimized the teeth are. I'm not sure why you linked it, if it undermines the point you're trying to make?

This article was just discussed here, might be a better link?

https://news.ycombinator.com/item?id=38153573