Hi, 

The qualifying marks to get into a government dental college isnt that low as compared to that of mbbs. 

A score of 510-520 could get you a governmwnt dental seat through AIQ.

However in states this mark might go a lil low depending on the state domicile you hold. 

But anywhere try for a score of above 500 so as to stand a chance.

Having said this nothing can be absolutely guarenteed since these are assumptions based on last years cutoffs. And cutoffs tend to vary every year.

So lets hope for the best. 

Good luck :)