You untwist it.
A stud definitely x
You don't put a back on a regular stud in your nose! What you do is get a proper nostril screw stud for a nostril piercing and put that in instead of the ear stud you have in your nose. If the backing comes off the regular stud in your nose and it is inhailed it can go into your lungs and then you have some serious medical issues.
To out in a nose piercing, you have toClean your noseClean the stud/ringGet the stud/ring wetGet your nose wetand thenjust jam it throughBut don't get a nose stud with a ball at the end, it hurts getting in and outso if i were you, i would get what they call the cork screw.
Providing it's healed from the initial piercing and it's cleaned regularly there is no need to remove it. However it may be more comfortable to remove it as blowing your nose regularly may make it sore.
What??
no only if your nose is really sensitive
Get something called a retainer : Its a clear nose ring . : )
small
A clear piercing retainer
Yes
One can find more information about nose stud rings on the official National Institute of Nose Health Website. A doctor can also be asked for information on the nose stud rings.
It is a tool that can grab the stud or what's left of it and remove it.