Jeanine started a dental practice at Prinses Mariannelaan in Voorburg in 1997. She graduated from dental school in 1993 and started working at a dental practice in Rotterdam. After four years, she thought it was time to start standing on her own two feet. She took over two dental practices and merged them into PM242, the predecessor of Tandheelkundig Centrum Voorburg. In 2018 she also started a dental practice in Landscheiding.