MBBS / BDS:
Bachelor of Medicine, Bachelor of Surgery, or in Latin: Medicinae Baccalaureus, Baccalaureus Chirurgiae (abbreviated in many ways, viz. MBBS, MBChB, MBBCh, MBBChir(Cantab), BMBCh(Oxon), BMBS, etc.), are the two first professional degrees in medicine and surgery awarded upon graduation from medical school by universities in countries that follow the tradition of the United Kingdom. The naming suggests that they are two separate undergraduate degrees; however, in practice, they are usually treated as one and conferred together, and may also be awarded at graduate-level medical schools. In countries that follow the tradition of the United States, the equivalent medical degree is awarded as Doctor of Medicine (MD), which is a professional doctorate.
On the other hand, BDS stands for Bachelor in Dental Surgery. There is a common exam for MBBS and BDS where the seats are basically taken for MBBS first and then for BDS.