No dying hair? No candy in school?

I know students or kids in our age like fashion and cares more about their out fit and looks than caring about their school work, so teachers are starting to worry about the future of students. Principals and teachers decide to have meetings to discuss about the issue, and then they decide to make rules for school, because teenagers doesn't really listen to adults. They made rules like no dying hairs or having wacky haircuts, because then students will only care about their looks, and they won't pay attention or give enough efforts to their either school work or homework. Some people think it's fine, but some people think it's really not fair, because they think dying their hair will not affect their work. There were girl who accidently dye her hair, people thought that she is going to got punishments. The principals said no, but the principal say she has to make a presentation in front of everyone about no dying hair and how out fits makes you not paying attention or giving enough effort into your class and homework. Some school also doesn't allow students to eat candies in school, not even having it in backpacks. I think it's not fair for me, because I think it is our freedom and our decision of whether we want or not, they shouldn't made a rule for that.....