I don't know if symmetry is really that ingrained in our dna as necessary for beauty. Most people part their hair to a side (rather than down the middle). There

I don't know if symmetry is really that ingrained in our dna as necessary for beauty. Most people part their hair to a side (rather than down the middle). There are few things cuter than a kid who smiles to reveal a missing tooth on one side. And what about dimples? A dimple on one side is nice but having them on both sides would look odd. A lot of that is just what we are used to seeing. And as others have commented, people in places like the UK often see teeth that are too perfect as artificial looking.