Colonoscopy does not require shaving, colonoscopy needs to cleanse the intestines to do intestinal preparation, need to cleanse the intestines of feces, intestinal cleanliness before the colonoscopy can be performed. The difference is that painless colonoscopy requires anesthesia, while ordinary colonoscopy does not require anesthesia, as long as the individual can tolerate it, ordinary colonoscopy is fine. The most important thing to prepare for colonoscopy is to cleanse the intestines, and a liquid diet is recommended 3 days in advance.