Dear Ranjit, to become a dentist, you should apepar for NEET. NEET is the entrance examination for admission to Dental colleges across India. To be able to appear in NEET, you should have completed 10+2 with a minimum aggregate of 50% in Physics, Chemistry and Biology/Biotechnology.  It is 50% for General Category, 45% for PWD and 40% for SC,ST,OBC. Once you appear and qualify in NEET, NTA will release the final merit list. And Dental colleges will release their respective cut offs and online applications. You can apply to thosr colleges according to your marks and participate in the NEET BDS counselling. Once you get admission in a Dental college, you complete you studies along with the mandatory internship and you become a Dentist. However, if you are interested in MBBS, the whole process is the same except that you have to check for cut offs released by Medical colleges and attend NEET MBBS counselling.