There's a portion on the aadsas application that lets you explain things like this. Also, like RuffDay said, some schools also have secondaries where you can explain this as well. Other than that, I don't think this event should deter you from applying to dental school. But just some advice for the future, never act on or say anything when you're involved in a situation of this nature before consulting a lawyer-often times people will mislead you so it leads to less trouble for them. Explaining why you admitted to being guilty on your application might be difficult to paint in a positive light. Just ace the DAT and you should be alright.