A man posing as a dentist has been arrested again less than a week after he was found in violation of his probation for committing the same crime in Warren County nearly 20 years ago.The man, Michael Richardson, 55, and his wife Lana Richardson, 52, have both been indicted by the grand jury in Coffee County for operating his practice, Amazing Smiles, in Tullahoma. Authorities say he was posing as a licensed dentist. The incident for which he was indicted happened last year before he moved his practice to Columbia.