Dentsply Sirona, York, Pa, and Futuredontics, Los Angeles, have signed an agreement to sell the latter to Congdon Street LLC of which Fred Joyal, the former CEO and co-founder of Futuredontics, is a majority owner. Dentsply Sirona will sell all of its shares, making Congdon Street the sole owner of Futuredontics, a dental marketing services and software company.