I think my teeth have holes

I’m sorry it’s just gross, sorry. I don’t know what I’m getting at, but long story short, I think my teeth are getting attacked by caries and I don’t know what to do. Any advice or tips or anything on fixing it from home?

This feels so gross, sorry, but lately I’ve been in the overeating junk food part of my cycle, I mean it’s always been my fault when I eat, but based on the last couple of years, I think there’s a pattern to it. A cycle of eating and purging and then eating too much and purging and then not eating in some kind of order. And I know it’s bad for the teeth, I do, but I’ve been too lucky and too ignorant and honestly too lazy to do anything. I’ve never seen holes (no clue what you call it in English, so sorry for the direct translations) in my teeth until now, so it’s always been fine. But I guess based on my history, the title; what a shock.

But the fact that I care has to mean something right? No need to answer that, and no need to read any of it, but if you did, thank you, and do you know or have any guesses or a hunch or anything on how to fix discoloured and/or caries infested teeth? Preferable without the involvement of a dentist.