There are 2 types of beauty:- inner beauty and outer beauty.
The choice of which is more important is left to you.
Inner beauty can be interpreted in many ways. I think the inner beauty is determined by a person’s thoughts and feelings.
When we see someone smiling, whether they have teeth or not or whether the teeth are aligned or not is not what matters in that smile. What matters is whether that smile is coming from their heart or not. That is what decides whether that smile is genuine or not.
A smile coming from a heart is inner beauty.