The application of Mettā meditation for the treatment of psychological and other healthcare related problems is the topic of current research. Hofmann et al. discuss in their paper the potential use for therapy and report insufficient data, with some promising studies so far. Those studies could show a positive impact on problems such as schizophrenia, depression and anxiety. According to Hofmann et al., there needs to be more rigorous research, especially with the application of Buddhist approaches to loving-kindness and compassion meditation. 
Parent tip: Help your teens find sustained community service opportunities that extend for a year or more where the student can be fully engaged in something that is important to them and, in turn, have a meaningful impact. Community engagement can take many different forms, from addressing local needs to serving in a soup kitchen to volunteering on a political campaign or making meaningful contributions at home. Look for opportunities where teens can work side by side with the people they are helping, instead of for them, which can sometimes feel patronizing and may not create as rich an experience.
Also an enemy wishes thus for his enemy: "Let him on the dissolution of the body, after death, reappear in a state of deprivation, in a bad destination, in perdition, even in hell." Why is that? No enemy relishes an enemy's going to a good destination. Now when this person is angry, a prey to anger, ruled by anger, he misconducts himself in body, speech and mind, and by his misconduct in body, speech and mind, on the dissolution of the body, after death, he reappears in a state of deprivation, in a bad destination, in perdition, even in hell, through his being a prey to anger. This is the seventh thing gratifying and helpful to an enemy that befalls one who is angry, whether a woman or a man.