A couple for you to consider. The first line is the main tagline, the second line a message in smaller letters featuring the overlying theme:

#1:
"Open up and say AAAAHHH . . . For your health (life)."
Early detection of oral cancer increases your chances of survival by xx%

#2:
"Dentist's don't just drill, they diagnose"
All dentists should examine you for oral cancer at your regular appointment.