Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 29 1-4 2000 12 15 121 126 Sh. Jafari D. Sedghi 2015 10 03 118 Dentistry students were studied to show the possible correlation between pH, concentration of Ca2+, P3+, Na+, and K+ of saliva and Decay, Missing, and Filling Tooth (DMFT index). Candidates were between 20 and 30 years old and had no background systemic disorders; medial and dental histories, age, sex, and DMFT index were recorded in a questionnaire organized for this purpose. Saliva samples were collected according to the unstimulated whole saliva method. Saliva was expectorated into the test tubes and the PH, Ca2+, p3+, Na+, and K+ measured. Results from case and control groups were compared and statistically analyzed. It was concluded that there was no meaningful correlation between pH, concentration of Ca2+, P3+, Na+, and K+ and dental decay in the population, where as in men there was a meaningful association between pH and decay. Also in women alone there was a relative correlation between concentration of P3+ and decay (PV=0.06). https://ijph.tums.ac.ir/index.php/ijph/article/view/1698 https://ijph.tums.ac.ir/index.php/ijph/article/download/1698/1679