If it's junior high school, I don't think students should do perm and dye their hair, but they are all college students, and it's actually allowed to pursue a little fashion occasionally. Moreover, there is no mandatory regulation in the school, and students are not allowed to perm and dye their hair.

But based on my student status, I suggest not to go too far. If you say that your hair is black and dyed brown, no problem, but some students dye their hair green, purple and red, it is very different. I don't recommend this kind of thing, because after all, I am a student, so don't pursue the trend too much.