Why did you go to Dubai for? Unless you've been partying and wasting yourself the last few years, I wouldn't consider having another degree like that in Civil Engineer a waste of time. Education is good, not to mention not a bad backup career. Now that it seems you have done more than enough shadowing, I would just focus on doing well in the prerequisite classes and the DAT 2nd try. If getting admitted to dental school is a walk in the park, dentistry would get cheapened then likely not as many would want to enter the field.