A man police say was a disgruntled former patient stormed into a California dentist’s office last week and shot three people, killing a dentist. The shooting took place Thursday at Smile Plus Dentistry & Orthodontics in El Cajon, according to the New York Post. The alleged gunman,Mohammed Abdulkareem, 29, was later arrested after a five-hour manhunt. The website the Yeshiva World identified the slain man as Dr. Benjamin Harouni, a dentist who worked at the dental practice owned by his father. Receptionist Yareli Carrillo, 28, and a man in his 40s were wounded, the outset said. According to an …