I have only one piece of advice to give to teens and young adults today that I know will save you from years of pain and expense.
Brush your fucking teeth PLEASE
I know its a pain to keep up with the routine especially while dealing with mental illness and sensory issues like I do as well. But even if you do the bear minimum. please care for your teeth because you really don't know what you have until its gone.
I currently have a broken tooth with roots exposed that hurts more than you could ever imagine.
I can barely eat comfortably anymore and get this.
I hate to be melodramatic but decay happens so much faster than you think so please learn from my mistakes and care for your teeth! They are the only set you got for the rest of your life. Keep them healthy so you whole can continue being healthy and happy.