Yes they can. I had a removable brace fitted and I am missing three teeth on my left hand side and two on my right due to my treatment. As long as you have at least one tooth either side of the teeth...
whenever you need them u might not even get them
No, not all people get both top and bottom braces at the same time. It all depends of what your orthodontist recommends.
Yes, you still can get braces they just move the ring that usually goes around the back teeth to the nearest tooth to the back :)
no suck my ball sack