How do you say have a beautiful smile in greek?

There isn't one single perfect translation for "Have a beautiful smile" in Greek, as the best choice depends on the context and level of formality. Here are a few options:

* Έχεις ένα όμορφο χαμόγελο (Echis ena omorfo chamogelo): This is a literal translation and quite common. It means "You have a beautiful smile."

* Να έχεις ωραίο χαμόγελο (Na echis oraio chamogelo): This translates to "May you have a beautiful smile," or "Have a nice smile," and is slightly more informal and well-wishing.

* Καλό χαμόγελο! (Kalo chamogelo!): This translates to "Good smile!" or "Beautiful smile!" It's a shorter, more informal and direct option.

The best option depends on the situation. For a more formal setting, the first option is preferable. For a casual setting, the second or third would work well.