Patient Beware. Dr. Thusha Lingham will perform unnecessary additional work without your authorization in order to wring every penny possible out of your annual maximum insurance benefit, leaving you with nothing should a dental emergency happen later in the year. Also, the quality of work is poor, a root canal done by Dr. Lingham in 2009 had immediate problems which required the attention of a surgeon, followed by a complete re-do of that tooth in 2011.