I have never had braces. As I get older and my teeth move, it may be inevitable.
Yes, it might be if you are determined to keep your teeth in line.  Orthodontic cases align and straigten teeth
My front teeth are beginning to come together, and I have a gap in the back of my mouth where I had a tooth pulled.
Yes braces can correct that, overbites, underbites, etc
I wonder if they would correct teeth grinding at night?
Orthodontic headgear
Orthodontic headgear is a type of orthodontic appliance attached to the patient's head with a neck strap or a number of straps around the head. The device typically transfers the force to the teeth via a facebow or J hooks to the patients dental braces or a palatal expander that aids in correcting more severe bite problems or is used in retention of the teeth and jaws of the patient.
Need for treatment and concurrent corrections.
Headgear is most commonly used to correct anteroposterior discrepancies. The headgear attaches to the
my teeth & groan at the bitterness of things. ... This is the one thought that relieves me about you a little - & I wish you might fix your eyes on it for the idea, just, of the possibility. I am in town for a few weeks, but return to Rye April 1st, & sooner or later to have you there & do for you, to put my arm round you & make you lean on me as on a brother & a lover, & keep you on & on,