Don’t test your spit right after brushing your teeth. That’s like checking your car’s oil after you just poured a jug of maple syrup in it. Wait at least two hours after eating or drinking.
First thing in the morning, before you even yawn, collect a little spit on the strip. Yes, it’s gross. That’s the point. Normal healthy saliva usually lands between 6.5 and 7.5.
If your number is low (too acidic), don’t panic. Maybe you ate a bag of sour gummy worms before bed. Your saliva is just mad at you.
How To Measure Ph In Human Body at Joy Ward blog