Unattractive teeth gap

Hi all, My wedding is in 3 months and I would like to do something with my teeth. I have 3 teeth missing in all, but out of that one can be clearly seen when I smile. I'm always conscious of it when I take photos. I try to cover that part of my face whenever I smile.There is nothing worse than a fake smile. I want to get it fixed but don’t know what can be done exactly. I am just curious to know if anyone has experience with this. I don’t want to look unattractive during my special day. I have anyway talked to one of a dentist in Edmonton and he suggested to get a new crown. But I don’t know if it will be a right decision to take a dental treatment at this time. What is the best way to fix my teeth gap before wedding? Has anyone taken any kind of dental treatment before wedding? Please share your thoughts.