Jonesboro, Ark.-based GPS Dental has added nine practices to its network. 2. Clean Smile Dental (Lancaster, Calif.) 3. R2 Center for Dentistry (Wichita, Kan.) 4. Taylor Street Dental (Chicago) 5. Todd Bell, DDS Family & Cosmetic Dentistry (Memphis, Tenn.) 6. Blake T. Billups, DDS (Memphis, Tenn.) 7. Artisan Dental (Madison,…