I used braces as a teenager
Thankfully I never had them, but my daughter does now.  Her teeth are very misaligned, so they'll help straighten them out 
They help to arrange teeth 
They're also used to correct underbites, over bites, open bites, deep bites, cross bites, and malocclusions
That is true
There is evidence of Hippocrates and Aristotle trying to figure out ways to make braces around 400-300BCE
Really? That is a long history of dental braces
ancient times. Around 400-300 BC, Hippocrates and Aristotle contemplated ways to straighten teeth and fix various dental conditions. Archaeologists have discovered numerous mummified ancient individuals with what appear to be metal bands wrapped around their teeth. Catgut, a type of cord made from the natural fibers of an animal's intestines, performed a similar role to today’s orthodontic wire in closing gaps in the teeth and mouth.
The Etruscans buried their dead with dental appliances in place to maintain space and prevent collapse of the teeth during the afterlife
Dental braces
Dental braces (also known as braces, orthodontic cases, or cases) are devices used in orthodontics that align and straighten teeth and help position them with regard to a person's bite, while also aiming to improve dental health. Braces also fix gaps. They are often used to correct underbites, as well as malocclusions, overbites, open bites, deep bites, cross bites, crooked teeth, and various other flaws of the teeth and jaw. Braces can be either cosmetic or structural. Dental braces are