Good Afternoon

Hope you are fine...

As per your query.. Yes!!! you may get seat in BDS course from 500 marks, and congratulation for your score. you did not mentioned your category so i am considering it general. Your expected rank will be around 76500 - 85025.

From this rank you have chances in following colleges for BDS course:

-> NAIR HOSP DENTAL COLLEGE & HOSP,MUMBAI
-> Faculty of Dentistry, Jamia Millia Islamia, New Delhi
-> ESIC Dental College, Gulbarga
-> Kalinga Institute of Dental Sciences, Bhubaneswar
-> AB Shetty Memorial Inst. of Dental Sce., Mangaluru

To Know your admission chances in MBBS/BDS/AYUSH colleges checkout NEET College Predictor know from given link below:
https://medicine.careers360.com/neet-college-predictor?utm_source=qna&utm_medium=neet_cp

Hope you found it helpful
All the best!!