The dangers of not wearing a seatbelt is severe injury or death. This happens because if you are not wearing a seatbelt during a sudden stop, you could be flung at a high speed, which ultimately leads to health complications…considering the human body is not meant to withstand that type of force.
“Among drivers and front-seat passengers, seat belts reduce the risk of death by 45%, and cut the risk of serious injury by 50%.” (Statistic from www.cdc.gov)