This is because of Ohio’s medical malpractice statute of limitations, which is stated in Ohio Revised Code (ORC) 2305.113(C)(1). This says you cannot file any type of medical malpractice lawsuit, including a dental malpractice lawsuit, more than four years after malpractice occurred. This means you have four years from the date of malpractice to file a lawsuit. If you miss this deadline, you lose the right to file a lawsuit.