Root canals and fillings do not hurt for 6 months absent some extremely unusual circumstances. One of the troubling things about this post is that you continued to go back to the same place. Find a different dentist. Go to a different dentist. A determination of whether there was actual malpractice requires a great deal of review and analysis beyond an internet back and forth. Here's why: [Blue Link Below]
Law Offices of Andrew D. Myers, North Andover, MA & Derry, NH provide answers for informational purposes only. Actual legal advice can only be given by an attorney licensed in your jurisdiction, thoroughly familiar with the area of the law in which your concern lies. This creates no attorney-client relationship.
If your dentist isn't removing the entire root during the root canal procedures, a new dentist should probably do it.
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I agree with all of the other responding lawyers that your first step should be to find a new dentist, one in whom you can have some confidence.
You may or may not have a valid dental malpractice claim. The only way to find out is to consult a lawyer who will review the dental records and get an expert, a dentist, to review them and advise whether or not dental negligence has occurred. I suggest that you consult a Dallas plaintiffs' lawyer who is certified in Personal Injury Trial Law by the Texas Board of Legal Specialization. A link to the Board's website appears below.
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