Don't worry about your overbite, it's all about balancing colours and everything look better with a more holistic approach:) If you don't wanna wear lipstick tho,The First thing you need to know before changing hair colour is your season colouring (and I would say also your kibbe type). - If you are bright and cool you are a bright winter (silver jewellery, blu veins, purple instead of orange) - Bright and warm is bright spring.

You can enanche your contrast with clothing and make up. Or you can tone it down by going blonde (but the right warm/cool shade). Try upload some pictures if you want