It really isn't rocket science. You don't need a book. You need to relax.
Go over what you wrote in your personal statements and (if relevant) supplemental essays. Stay cool, calm, and collected. Make sure you answer the interviewer's questions directly and confidently without rambling on. Be friendly; dress professionally. Don't fidget. Make eye contact.
There are common interview questions (e.g. strengths/weaknesses, why dentistry, etc). Have a mental outline of the answer you want to give so you can give a good answer that covers all your points without taking forever to get the idea across. I would also review the school's website and Facebook page/other social media. See what/how they promote themselves and have a few questions to ask so you can also (1) learn more about the school (since at the point of interviewing, they are sort of promoting themselves to you too) and (2) so you can engage the interviewer and demonstrate that you did your homework.
