Dental PPOs keep expanding their networks and dentists seem more than willing to join. The lastest NetMinder data shows that during 2009, the average national dental PPO network grew its total provider locations by 14% and its total unique dentists by 10%. The average national dental PPO (sample = the top 15 networks) contracts with 60,000 unique dentists representing 115,000 total provider locations (access points). The average dentist is listed in more than 7 directories. And the trend seems likely to continue since the typical network contracts with only about 1/3 of all network dentists.