My father practiced dentistry for well over 50 years in New Orleans, La. He took great delight in encouraging nutritional dentistry. The patients saliva sample was sent to a State of La. lab, which then forwarded their PH reading back to him. Today, PH strips do a faster job, and probably just as good.
My dad recommended elimination of all sweets, except for fruit and vegetables; plus rinsing the mouth after eating anything.