What do I do to make my teeth straight after I haven't worn my retainer in a few days?

painfully. If your done with with your braces and you messed your teeth up again… then you may have to wear braces again. I dont think not wearing a retainer a few days will mess your teeth back up, but im not sure.

i do wear it every day now

Yeah, just force it back in. I doubt they would’ve moved all that much after just a couple of days and if they have then you either weren’t ready to make the transition to a retainer yet or you’re still in the stage of wearing it all day every day and you MUST keep to it. This comes from experience - the only thing you can do is put it back in, and ASAP. If they’ve really moved a significant amount then it should hurt after it’s been in for a couple’a hours and when you take it out. Wear it every night - minimum - for about a week and you’ll definitely see an improvement.

I have retainers now. I am 13 and sometimes when I dont wear them, My front bottom row teeth go back to there original state. Make sure you wear them. Thats all I can say.