The anal sphincter can usually return to normal after an injury. If the sphincter is only slightly injured, such as due to constipation and other factors that cause anal fissures, the anal sphincter can return to normal function after the wound recovers. The main thing is to do a good job of cleaning and sanitation of the injured area to avoid infection, pay attention to eating a diet with more fiber, and keep the bowels open to avoid constipation and other conditions that can aggravate the wound. If the anal sphincter is fractured due to surgery, recovery is slow and it takes about 6-8 weeks to return to normal. You can insist on doing more anal lifting exercises to exercise the function of the anal sphincter, so that it can recover as soon as possible.