I have had teeth issues my entire life. I do not drink or use drugs.
How would an MD or DDS know if a patient was abusing alcohol or drugs?
Blood tests are not routine for sinus infections and DDS do not perform blood tests. Health consequences are probably among the very last things an alcoholic or addict thinks about.
Do you think when you pick on your friend, it's going to make a difference?
If picking on and/or carring for an alcoholic/addict could cure them, none of us would be here. To beleive so, suggests any of us have power over someone else and their choices.
Alcoholism and addiction are progressive. If what your friend does is unacceptable to you, you have the choice to disengage from him.