The DAT book says "A candidate can apply and retake the test as many times as the candidate wishes"..."the results of the 4 most recent DAT's are released on the official transcript of scores and forwarded to dental schools"
you can take it as many times as you want you just have to wait three months in between attempts. However I think I read on some dental school webpages that they prefer you only take it 2 times. However I dont know how valid that statement is. You may want to check with the individual dental schools you are interested in.
savvysearch is right.
You can take the DAT as many times as you wish. I took it 4 times before getting accepted. None of the schools i interviewed with cared how many times i took it.