Ditto Nicole P. below.
Braces are either cosmetic or for structural problems of the teeth/jaw.
When I was in 7th grade, I had braces for 3 years. Also had to extract several teeth for it.
Now as an adult, MANY years later, I STILL need to wear a retainer. Otherwise, my teeth, shifts. Wanting to go back to its original placement etc.
My Dentist, even without telling him my braces history and for what kind of bite... KNEW why and accurately deduced, my mouth/teeth situation. And yes, I need to wear a retainer at night, for the rest of my life. Or else, my teeth will, shift. If I do not wear my retainer, nightly, within one day my teeth shifts and the retainer will be tight.
And this shifting, is normal. Meaning, my Dentist said that, the jaw/teeth is NOT static. It shifts and per age and growth and a jaw naturally does this. It is not a static, body part. So, meanwhile, braces are NOT "permanent." I also know an adult, who recently had braces again. Because, her teeth shifted and she wanted to, for cosmetic reasons, get braces again.
But sure, individuals vary. And their mouth.
In the USA, braces are commonplace. And seems to be a thing that all kids get and do. But in other countries, braces are not as commonplace nor "mandatory."
Inevitably, get a 2nd or 3rd opinion.