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Drinking coffee before blood test can affect the results of tests that measure blood sugar and cholesterol levels. Coffee contains caffeine that is easily absorbed into the system at a fast rate. Caffeine can temporarily raise blood sugar levels resulting to an inaccurate fasting blood sugar (FBS) result.
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.