How can I (naturally) stop having a gummy smile?

I have a decent set of lips. They're not thin, but they're not too plump. When I smile, though, my upper lip curls up and disappears and my gums show. I am complimented a lot on my smile, but it's definitely more because I have nice teeth and a genuine smile. I'm a very smiley person and laugh a lot as well; so this isn't something I can really avoid 😂