At what pH level does demineralisation and enamel caries begin?

Demineralisation and enamel caries begin at a pH level of 5.5. At this level, the acidity of the oral environment becomes strong enough that minerals, primarily calcium and phosphate, are leached from the enamel, leading to the potential for decay. This pH threshold is crucial for dental professionals to understand as it marks the point where tooth enamel starts to lose its structural integrity due to acid exposure, which can be caused by dietary factors or bacterial activity in the mouth. Maintaining a neutral pH above 5.5 helps to protect enamel from caries, making it important for both preventive measures and patient education regarding oral health.