Dr. Thomas Streitz works on patient Colleen Reeves as his son Dr. Daniel Streitz and grandson Dr. Dan Streitz Jr. look on at their dental practice in Joliet, IL on Tuesday, June 12, 2012. | Matt Marton~Sun-Times Media
Dr. Danield Streitz,( left), Dr. Thomas Streitz and patient Colleen Reeves and grandson Dan Streitz Jr. (right), look on at their dental practice in Joliet, IL on Tuesday, June 12, 2012. | Matt Marton~Sun-Times Media
Dr. Thomas Streitz talks with patient Colleen Reeves at his dental practice in Joliet, IL on Tuesday, June 12, 2012. | Matt Marton~Sun-Times Media
Dr. Danield Streitz, (left), Dr. Thomas Streitz and grandson Dr. Dan Streitz Jr., (right) look on at their dental practice in Joliet, IL on Tuesday June 12, 2012. | Matt Marton~Sun-Times Media
Dr. Daniel Streitz, (left) patient Colleen Reeves, Dr. Thomas Streitz, Kathy Wilhelm and grandson Dr. Dan Streitz Jr.,look on at their dental practice in Joliet, IL on Tuesday June 12, 2012. | Matt Marton~Sun-Times Media
Dr. Daniel Streitz, (from left), Dr. Thomas Streitz and grandson Dr. Dan Streitz Jr. look on at their dental practice in Joliet, IL on Tuesday June 12, 2012. | Matt Marton~Sun-Times Media
Dr. Daniel Streitz, (left) Dr. Thomas Streitz and grandson Dr. Dan Streitz Jr., (right) look on at their dental practice in Joliet, IL on Tuesday June 12, 2012. | Matt Marton~Sun-Times Media
JOLIET — Over the last 56 years, generations of patients have placed their dental health in the hands of Joliet dentist Dr. Thomas Streitz. For some time, patients have had the option to see the second generation of dentists, Streitz’s son, Dr. Daniel Streitz. Later …