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Most post bacc programs don't guarantee that you will get into dental school. A few however do guarantee you admittance to their dental school if you say get say a 3.5 or above in the program and have like a 17 min on the DAT. For specific details on each program I would go to that program's website, but a good starting place is going to the postbacc forum in the interdisciplinary area of SDN. Click on the SDN Forums and scroll down a bit and you'll find it.