The importance of physiological pH monitoring.

Body fluid	Function	Balanced pH	pH imbalance	Physiological Status	Ref.
Saliva	• Maintain healthy mouth	6.2–7.6	Acidic (<pH 5.5)	• Demineralization and the breakdown of tooth enamel	55–60
				• Mineral deficiency (e.g. calcium and magnesium), often due to poor digestion
				• Chronic generalized periodontitis
	• Protect teeth		Alkaline (>pH 5.5)	• Plaque formation
				• Chronic generalized gingivitis
Tears	• Prevent eye dryness	6.5–7.6	Acidic (<pH 5.5)	• Chemical damage	61–64
			Alkaline (>pH 5.5)
Urine	• Excrete waste fluid from the kidneys	4.5–8.0	Acidic (<pH 5.5)	• Metabolic syndrome	65–69
				• Diabetic ketoacidosis (a complication of diabetes)
				• Idiopathic uric acid nephrolithiasis (the process of forming a kidney stones)
				• Diarrhea
				• Starvation
			Alkaline (>pH 5.5)	• Kidney stones
				• Kidney-related disorders
				• Urinary tract infections (UTIs)
Sweat	• Control body temperature	4.5–7.0	Acidic (<pH 5.5)	• Acidosis	70–76
				• Excessive sweating
			Alkaline (>pH 5.5)	• Electrolyte imbalance
				• Cystic fibrosis
				• Physical stress
				• Osteoporosis
				• Bone mineral loss