why does justin bieber always smile at people?

To hiển thị his smile for everyone to see and Enjoy,also to hiển thị his những người hâm mộ how greatful he is to have them there scraming his name and cause he's happy^_^

he smiles bc he has a great smile an he looks so cute when he smiles.and when he smiles he shows everyone how greatful he is to have his fans