GDC Alappuzha had cutoff of 481 marks last year equivalent to an AIQ rank of 29385 for general category. I will enlist the cutoffs of other dental colleeges of Kerala -

1. Government Dental College, Kottayam - 482 marks, 28777 AIQ rank
2. Government Dental College, Kozhikode - 481 marks, 29456 AIQ rank
3. Government Dental College, Thrissur - 485 marks, 27575 AIQ rank
4. Government Dental College, Trivandrum - 509 marks, 18578 AIQ rank

Having said this cutoffs keep fluctuating from year to year as they depend on various factors like number of candidates appearing, paper level difficulty, etc. So try to score around 500-510 and above to be on the safer side.

Refer to the site below for more details regarding the same...

https://medicine.careers360.com/articles/neet-cutoff-kerala

Best wishes.  Thank you,