hi,

Talking about BDS admissions via OBC category as per the Medical Council of India, you must be getting a percentile of above 50 the Neet examination to qualify in that regard, having passed your boards with 50% aggregate in physics chemistry and Biology
However these statistics and numerical may vary depending on whether you are wanting to get admitted to a college in your state where the 85% state reservation or you want a college across India using the 15% all India quota, also it would depend if you want a government college or private college
Yes to get into any college across India weather private or government using either state of all India quota the 50th percentile will be enough
But if you want one of the better colleges at the government  and private sector ,then I think you need to lift your score around 400.

Thanks..!!