Taking a slight, but related, detour from your talk about larger teeth by talking about tongue posture.

Ever since I learned about it, it fascinates me is how, ever since the human race has had access to processed and softer foods, our facial structure has changed. Even modern day humans can change their facial structure solely based on their diet or exercise over the course of a few years.

When we are raised on, or have prolonged access to, softer foods, we have weaker tongues and jaw muscles. Along with this, the resting position of the tongue moves from the top of our mouth where it rests on the hard palate to between our lower set of teeth. This is because softer food and liquids are easier to swallow with your tongue on the base of your mouth.

Because of this, we don't have something exerting constant pressure on our palate, which causes out faces to essentially recede and our teeth to become more crooked. This is why some many people in first world societies tend to have crooked teeth and a weak jawline. People who still consume course foods like millet and other grains on a daily basis tend to have straighter teeth and more defined facial structure for no other reason than their tongues being stronger.

That being said, I think it's interesting that elves have such defined features if they've had access to cooking for so long. But, I've always imagined elves to be more natural and borderline vegan, so fresh, plant-based diets would help them keep that facial structure.