I'm not sure about unbalanced body parts, but crooked teeth can be caused by many things. Failure to eat tough food like meat in your adolescence causes crooked teeth and a weak jaw. Diet also affects your mouth a lot. Eating too much sugar, carbs, and processed food can cause weak teeth, bad gut and bad mouth bacteria growth.
Chakras rule some parts of the body and maybe if theres an issue with the chakra, whether is blocked or dirty, can cause problems. For example back pain can be caused by a blocked, misaligned, or dirty base chakra. I'm not sure if chakras can cause bad teeth and/or an unproportional body though.
Remember that we aren't perfect beings. We come in different shapes and sizes. Perfection comes through meditation and achieving The Magnum Opus