As per the last year, Adhiparasakthi Dental College & Hospital, Melmaruvathur had cutoff of 573 marks equivalent to an AIQ rank of 3913 for general category. There are 13 private dental colleges available in Tamil Nadu. Out of them, the least cutoff recorded last year was 564 marks (5198 AIQ rank) and Ragas Dental College & Hospital, Chennai also had the same cutoff.

So you can target scoring above 575-580 to be on the safer side.

Having said this cutoffs keep fluctuating from year to year as they depend on various factors like number of candidates appearing and also the paper level difficulty, etc.

Refer to the link below to know the cutoffs of all the private and dental medical colleges...

https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

Best wishes. Thankyou.