For hiccups i just held my breath and that almost always worked.
But for What I call Kanker sores (those sores you get inside your mouth kinda like Cold sores), I held my lip out an dput salt directly in the sore. It stings a lot but after it stops hurting as much, which took about a minute, you just like it off and go to bed and the sore would pretty much be gone in the morning.