It is not mandatory unless your child has structural problems.
In our country, braces are seemingly a "have to get" thing and for appearance.
In other countries, it is not. Different cultural priorities.
I had braces, when I was in 7th thru 9th grade.
I STILL have to wear retainers at night to this day.... otherwise my teeth STILL shifts back.
My Dentist said, they did not do a good job with my braces... and I maybe didn't need it... my teeth were pushed back to much and so my tongue now has inadequate room in my mouth for it. Sure, my teeth are straight and 'nice' and pretty... but, the braces also caused problems... which are NOW evident. And my 'bite' is not ideal. And I will NOT get braces again. I don't believe... it is the thing to do. UNLESS you have structural problems or bite problems with your mouth.
ALSO, my current Dentist said.. that the mouth/structure still changes... when a child and teens and older, and there is NO way to "predict" how the mouth will be, when fully formed. Not to mention the growth of the permanent teeth, still. Etc. AND, that the teeth/mouth has "memory"... so therefore, he said it is NOT unusual, that I STILL HAVE TO wear retainers... now.... currently... in my adult life. Because, the person's teeth/bite can still shift... back.
Braces... is not permanent in that sense.. BECAUSE you will STILL have to wear retainers... all your life, to keep your teeth in that position, that the braces were used for.
Some things to ponder.
This is what happened to me, due to braces.
All the best,
Susan