You have not stated which dental college you want information about so I will tell the general general eligibility criteria for admission in BDS college in Bihar state.
First and the most important point is that you must qualify the NEET exam held on national level by NTA and second, you must clear the cutoff of the college you want.
you can use NEET college predictor tool by clicking here https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer
The average expected cutoff to get into the BDS in government colleges is 429.5
so as you can estimate how much marks you should have to get into BDS course in the state of Bihar.
hope it helps.
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