Well, there are many books available in the market. But if you want you can start with the NCERT books.Following are the names of some of the books for AIIMS MDS entrance exam-

• Complete Review of AIIMS - 25 Years + Supplement AIIMS - 25 Years: Postgraduate Dental Entrance Examination
• All India Post Graduate Dental Entrance Examination 7th edition Vol -2 2018 + Neet MDS Pattern 2017 Paperback– 2018 by Neeraj Wadhawan.
• Target MDS AIIMS 2ed Vol 1 & 2 (2014)
• AIIMS PGMEE May 2018 Perfect Paperback – 2018 by Dr. Apoorv Singh, Dr. Sandhya Gaur and Dr.Brijnanda, Dr. Abhishek, Dr Rajeev Ranjan, Dr. Anil Shekhawat
  
• Dental Pulse Vol 1, 2, 3 Paperback – 2017 by K. Satheesh Kumar Reddy, M. Swapna.  All the best for your preparation.