Dribbble - Thermostat-App-Full.png by Daniel Bruce
facebook sizing cheat sheet
ios App Icon
i dont know about a dental hygiene app but the colors and textures are great!
"TAPAS Phone OS design" by RIGO design. Some interesting ideas, if admittedly skewing a bit too far into skeumorphism at points.
Greenlots Brand Identity and User Interface by Higher , via Behance
iPad conference call app by Arron Hunt http://dribbble.com/shots/628948-iPad-conference-call-app