Having to wear braces or a retainer is actually quite common. A lot of people have had to wear one or both at one point in their life. They are used to help straighten and align teeth. They can also be used to fix tooth gaps. Another option are to use Invisalign liners. These are clear customized trays that are used to straighten your teeth.
Caring for your teeth while wearing braces or a retainer is quite important. Consult with your dentist on the proper oral hygiene while using these dental treatments.