The main character's mother is a drug addict and she acts erratically, yelling at the main character, hassling him for money to buy drugs, and being otherwise negligent.
Character wearing grills takes them out to eat. Not a tooth damage but I have a general dental squick and it squicked me a little bit, like someone taking out a retainer would.
Juan becomes a father figure for Chiron in his childhood, and dies sometime before the second act of the film when Chiron is a teenager. The way he died is not mentioned
not a mental institution, but a scene taking place outside a rehab center. no medical stuff shown, just the generic benches and visitor tags. towards the end of the film.
a character describes having sex with a girl at school in detail and this scene is later seen in the main character's nightmare with no nudity but noise (moaning and etc.) and thrusting movements. there is an implied sex scene between the main character and his love interest at a beach, no nudity, some noise. a woman is implied to be a prostitute and characters discuss her job.