My front two teeth I would like to have them a bit longer than rest of the teeth. I have already gotten crown fittings for my front 4 teeth, 2 times earlier, but not so satisfied. I want the front two teeth to be a little longer for better smile, else my smile looks so straight. Please suggest if I would need to get new crowns fitted, or is there any procedure to elongate the two teeth externally? Also, would this affect the 2 teeth ((incisors) beside my front two teeth? How much would this cost as well.