Ive had my tongue pierced for almost two years & I have to take it out every other day because of my job. However, today I went to put it back in & it wouldn't go through the hole. After applying pressure, it finally went through, but it's been a little sore ever since. What should I do to fix this problem?

You probably need a clear tongue piercing retainer to keep the hole open. If you've had it for over a year it's safe to say that it won't close after one or two days, but it can heal if you leave it unpierced for a long time.