[Dr Sepehrara]

Hi and welcome to the forum

if the size of the gap is too big, braces (invisible or traditional fixed braces) would be the best option as this would move the teeth closer together.

If the size is relatively small your options would be:
- braces (as above)
or
- veneers (either made of composite or porcelain)

I hope this helps

Kind Regards

Raha