Answer: Yes, if you want to walk across the border from Nogales, Arizona into Nogales, Sonora (Mexico), each U.S. citizen, including your daughter, will need a valid passport or other accepted travel document. Since you mentioned that none of you have a passport, you would not be able to legally enter Mexico without one.

Answer: If you are considering dental care in Nogales, Mexico, this detailed experience from a visitor offers an excellent roadmap for a smooth and safe visit.