Google, Google it, just Google it up. It'll appear.
Then call or visit a d ask your question.
Or, ask the lawyer to point you in the right direction.
Be advised, they're hard to find if you're not connected.
They will only say it or write it if it's true.
Generally that is the way it works. Your lawyer would find a dentist to testify that what happened was malpractice. However, you can talk to some dentists & see what they believe.