My question involves medical malpractice in the state of: New York

in 2007 my general dentist told me i had peridontal disease. he said bone grafts didnt work so he would do a deep cleaning. he never told me how serious the problem was or that it required lifetime treatments, but more importantly he never said i should see a specialist. over the last 4 yrs. i've been trying to find someone on my own to treat was has now become a "health" threatening issue. isnt my first dentist liable for not telling me all the facts or sending me to someone who knew more about this problem?