Plano Dentist - Dr. Jason Montgomery and Dr. Nicole Sivie Providing World Class Smiles!! The Art of Dentistry has come a long way and nowhere is it more evident than at Lonestar Dental Group, a Cosmetic and Family Dental Practice in Plano, TX known for its' commitment to patient service and excellence. You are not a number...you are a person, a Most Valuable Person. We know you by name. All of us desire to be treated as a special guest, a brother, sister or a longtime, familiar friend. At Lonestar Dental Group, you are an important part of our lives, and because of this, we treat you as family.