I came out of NYUCD and found it much easier to live a few blocks from school. Some of my classmates commuted from longer distances. On the subway can be a little distracting to study. If you will be taking commuter trains out of Grand Central, much easier, as many people traveling to the burbs are reading, catching up with work. Really depends on what time of the day you are traveling. You could always plan library or lab time during the rush hour time. I do agree with some of the past posts, dental school is challenging enough, adding another variable, could make it more challenging.
But it is doable....