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Take a glass of water to bed and leave it on the bedside cabinet.
When you awaken, spit into the water.
Do NOT try to gather spit from the inside of your mouth, just spit whatever you have, however little, into the water.
Allow to stand for 15 minutes, then gently swill the contents round in the glass.
Hold glass up to the light.
If the spit remains on top of the water, or dissolves, you are OK.
If it turns the water cloudy, you have a Positive Indicator.
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