You could just be honest with you parents. Maybe show them some pictures of the style you like or say that your friends have this hairstyle and it looks really nice. Another way (the way i am hoping to use!) is that my friend has a really nice swept bangs (side fringe) and lots of people say we look identical so you could try and convince them with that!!! My last idea if all else fails say that you will pay half of the hairdressers price or you could simply ask the hairdresser whether it would suit you and if so be honest and talk to your mum about it.
Ask her when she has the time to talk about it with you. Mention that it is your hair and you feel entitled to have a say in how it is styled. Also explain that it is not an extreme change to your current style (if this is the case).
To convince your mom that you are not wasting money, prove that you are living within your means. You shold have some money in savings, and you should have reasons for the purchases that you are making.
Tell her how much u want to do it and why u should.
convince herif it doesn't work convince your dad
Tell her you are responsible
Brownose
Just keep asking her about it. It actually took me three years to convince my mom and dad to let me get my bellybutton pierced.
Trying to prove something like that will convince her that you dont need him she should notice it by herself.
If you want to convince yoor mum to let you buy a BB gun then you should do some research or make some point on why you should have the gun i.e safety!
sorry but that really depends on your mom....
Move out.
Just ask her for one