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Drink Water. Many people believe they should avoid water before a blood draw, but this couldnât be further from the truth. Drinking water will not only make you feel better if youâre fasting, it will also make for a smoother blood draw.
My doctor and and lab have never told me I couldn't brush my teeth before fasting. I doubt toothpaste or mouthwash would have any effect. These are not ingested after all and there is no sugar in those products anyway. So brush your teeth, rinse, drink water before you take your fasting blood sugar in the morning. And make sure you wash your hands.