At present, teenagers tend to drink alcohol while they are underage. And it can affect their behavior. According to Greenblatt (2000), drinking alcohol can affect to adolescent’s behavior and emotion in negative way. For some families which their adolescents drinking alcohol, it will affect teen’s physical, psychological, social and alcohol addiction. Furthermore, Alcohol can show the teenager’s health in negative ways. For example, teenagers drink alcohol which can lead to obesity, high blood pressure, disorders of the brain’s behavior. This can show that alcohol is unhealthy for teenagers. Moreover, alcohol can cause of accident. Each year, the accident rate is increasing. Especially, during festivals and holidays such as New Year or Songkran festival which have a lot of injuries and deaths.