BDS and BPT both have some extra subjects when compared to the MBBS syllabus and also few topics are not in as much detail as in MBBS like in BDS' anatomy the abdomen isn't in as much detail as in BPT and in BPT its the same for histology (even though it will be required in 3rd year during surgery and medicine classes) also BDS is focused on dental surgery and overall health as it should be whilst MBBS and BPT fields that require assesment, diagnosis and treatment of ailments all over the body (although the mode of treatment is different in both).

Hello student,

Syllabus is almost the same in the first year, mbbs and bds have anatomy, physiology, biochemistry but bds also has an additional subject known as DENTAL ANATOMY AND HISTOLOGY. and trust me, it is the most interesting subject of first year.

The practical do differ. In the first year, you'll have pre medical dental material and conservative dentistry. MBBS obviously won't have these. 

Second year both of them will have pathology, microbiology, pharmacology and the fourth subject MBBS has forensic and BDS has dental material. Preclinical of prosthodontics and conservative dentistry is there.