Why does a girl always smile when she speaks?

Why does a girl always smile when she speaks? This girl is naturally fond of laughing and has a cheerful personality. So he always smiles when he speaks. If you are not born with a small face, or you are not very cheerful and have a bad personality. He can't smile all the time when he speaks. He smiled and talked to people, which made people feel particularly close and liked him. He also wants others to like him and be good to him. You remember, so he always talks with a smile. This is also one person's. Determined by psychological quality.