What can I do to help my smile? ''bottom teeth smile'' (Photos)

Hello, I am 18 years old and i have a 'bottom teeth smile'. By this i mean when i smile/talk my top teeth are always hidden and you can only see my bottom teeth. When i was younger with my baby teeth my smile was fine however when i started growing adult teeth at about 8 i noticed this. My top lip covers my set of top teeth and i have what you call a 'bottom teeth smile' which looks weird.Even when i try to smile very big, it still covers it. Please give me advice on this Thanks

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