Finish up all of your prereqs and get A's. Take the Dat and do well and I think you will have a good chance. So you screwed up one year but you showed that you have the drive and brains to do well. I think that ADCOMS will see that.
Id say go for it. I dont have much experience applying yet, but I know that dent schools place great emphasis in grade trends. theyll see that uve improved and like tucson said that u have the brains to do well. Additionally i believe dent schools are quite 'forgiving' of freshmen year mistakes. Kill the additional science classes that are required, do well on the DAT's, and youll have as good of a shot as anyone.