Deviated noses are a common problem. The bridge, middle, and/or tip of the nose may be crooked. Sometime the external nose is straight, but the internal nose and nasal septum is deviated. Twisted noses may be major, or very small & minor.
Slanted noses are usually developmental and congenital. Trauma is another major reason some noses slant.
Many options exist to straighten a nose. Rhinoplasty surgery, deviated septum surgery, septoplasty are the best options. Minor imperfections, asymmetry, and slanting may be treated with small injections, in order to avoid rhinoplasty surgery.
Speak with several plastic surgeons and determine whether treatement is appropriate for you.