Like someone said above, take it like you don't get another chance. And make sure you study and practice every section. Don't skimp on a section because you think you'll be fine in that section. I took the DAT 3 times unfortunately. The first time, I hadn't done my research on the DAT, and barely studied at all. I didn't even apply with my scores. 2nd time, I used Kaplan only, and did well on everything but the PAT. I didn't get accepted because of my PAT score. I thought I was pretty good at that section, but the Kaplan practice questions were just way too easy. The 3rd time I took the DAT, I took several months and just studied and studied and studied, and did tons of practice questions with several study sources. I improved my score drastically, and got accepted to my top choice.
I was accepted with a 3.86 gpa, and 20AA/21TS/23PAT
The admissions committee really liked that I kept trying and improved my scores.
I'm now about to finish my first year of dental school.
So yea, definitely do your research on the DAT, and make sure you put in all the necessary work the first time. But if you need to retake, it's fine. Just work harder the next time.
Good luck!