Hello,
The treatment would depend upon what is causing your gummy smile.
It could be due to
1) the large upper jaw or the position of the jaw is low
2) Short teeth
3) short or hyperactive lip
4) excess gum growth.
According to the cause you could either go for
1) orthodontic treatment (braces)
2) Gingivectomy (removes excess gums)
3) Botox injection (relaxes lip muscle)
4) ortho surgery (severe cases where the jaw position is corrected)
5) Veeners (where the size and shape of the teeth can be changed)
Some images would be helpful to guide you better
Next Steps
Visit a dentist to know the extent of your gummy smile and would be the best and quickest way to get the result you want