Dear Aspirant

You have not mentioned your category . You must specify that so we can help you precisely . Anyway I assume you as an general category candidate. Analysing cut off from previous year I can say that you must score atleast 500 to get dental colleges in kolkata like

DR. R. AHMED DENTAL COLLEGE AND HOSPITAL, KOLKATA

GURU NANAK INSTITUTE OF DENTAL SCIENCES AND RESEARCH

and if you want to get government dental colleges outside Kolkata but in West Bengal like

NORTH BENGAL DENTAL COLLEGE

KUSUM DEVI SUNDERLAL DUGAR JAIN DENTAL COLLEGE AND HOSPITAL

HALDIA INSTITUTE OF DENTAL SCIENCES AND RESEARCH

BURDWAN MEDICAL COLLEGE , BURDWAN

then you must score 490

And if you want BAMS in Kolksta as a general candidate then your score must be more than  450

You can check further here

https://medicine.careers360.com/articles/neet-cutoff-west-bengal

Predict your chances here

Best Wishes.