Miss Dr. Lehnertz studied dentistry at the LMU Munich and received her license to practice dentistry in 1993.
After her time as an assistant dentist, she opened her practice in Forstinning in the summer of 1997.
At the same time, she completed her doctorate in prosthetics at the LMU in Munich at the chair of Prof. Dr. Dr. h.c. W. Gernet on the topic: Investigation into the accuracy of fit of groove-anchored In-Ceram adhesive bridges - conventional manufacturing vs. Celay processes.