If the tongue piercing is removed for even one night, it will partially close up as it is a muscle, which is very unlike ear piercings. It should close up, but just like trachs, some close and some don’t. If it doesn’t close after about a year it should be evaluated for a surgical closure if it is causing problems.
Also to know is, is it normal for your tongue piercing hole to stretch?
Since each of the balls unscrews from the barbell, you simply need to unscrew one end, pull the entire piece of jewelry out, and then slide the new one in. The tongue piercing is also extremely easy to stretch; usually, this is done by just inserting the next size every couple of months.