Rahaf Safadi, Riham Al-Safadi , Reef Al-Safadi , Zahra Al-Saigh , Maram Al-Otaibi , Hassan Al-Farraj , Fatimah Al-Otaibi , Amal Al-Abdulwahab, Yasmeen Al-Bagshi. Relationship of Drinking Water to Dental Calculus in Saudi Arabia: Riyadh in Comparison to Eastern Province. ijetst 2018, 5, 6637-6645.