The permissibility of nose straightening, or rhinoplasty, in Islam is a complex issue with varying interpretations. Some scholars consider it permissible if done for medical reasons, such as correcting a breathing problem or a deformity. Others may view it as permissible for cosmetic reasons as long as it does not involve altering the natural shape of the nose excessively.
However, there are also scholars who believe that any form of cosmetic surgery, including nose straightening, is haram. They argue that it is a form of altering God's creation and can lead to vanity and excessive concern with physical appearance.
Ultimately, the decision of whether or not to undergo nose straightening is a personal one that should be made in consultation with a qualified Islamic scholar.