Temporary curses?

Who says that i ve never heard of that ive cursed many who have done me wrong and nothing happened to me

There's also karma spells. When you said "teach them a lesson" that's what I thought of. Or you could make a poppet so you could destroy it when you want. I find the easiest way to make sure you can undo a spell when needed is to make something then take it apart. It's also true that you could just write your own spell that specifies a time limit.

If cursing is the unfortunate route that ppl MUST take, than I'd suggest you take a cleansing bath to remove that negative energy from you so that you wont suffers repercussions in the future.

The funniest "lesson" medicine I've ever seen in action was one where everytime the person spoke an ill thought, they bit their tongue. I was literally holding my sides in laughter, my ribs hurt so much. I removed it from him after seeing it for myself for an entire day of some of the best entertainment of my life. It all stopped immediately after removal and his tongue quickly healed. I decided enough was enough because his tongue began to bleed from all of the bites. I still fought to keep a straight face while in ceremony though! I can't help but laugh just thinking about it to this day. I wasn't the one who casted it, it was someone from my family (not sure which one) who did it to my boyfriend (now husband). He had argued with my mother over the phone (we were all adults) and a few ours later, he couldn't stop biting his tongue. Such medicine was very common in my household growing up. Its never done to seriously hurt, it is to teach a lesson only. And it isn't called cursing.