I only have one front tooth, so the top row of my teeth are overlapping the bottom. Any suggestions ? (photos)

You can opt for Invisalign treatment to get your teeth aligned properly or Six month smiles treatment for much better results.

Well this cases are complex due tot he midlle line, also the age, and if you are considering about having braces for at least 2 years?if you are not thinking about braces, then there si another option, that will solve the problem, and you will look much better, this would be veneers, your teeth will look more aesthetical, but you will not be able to correct the middle line, but you will be able to make the layout like if you had 2 central teeth, and convert canines , this is a procedure that has good results, and you will have a much better smile and you will feel more confident.