Depends entirely on the extent of your problem. If you are young (in your twenties or below) a brace can sometimes sort this the best.

If oldr, you might need some extensive work, and it can be costly. But well worth it for the confidence you will feel.

Best idea is to take the plunge and go and get advice from a good dentist.

Most dentists will do cosmetic work. You could contact The British Dental Association for advice on how to find the best dentist for you.

Good luck!