Dehydration
Dehydration can cause white tongue, most often seen in people who don’t drink enough water. When dehydrated, the body conserves as much water as possible, preventing water from passing through the tongue membrane and the mouth. The result is a dry, white patch on the tongue that’s invisible when you drink enough fluids.
In addition to not drinking enough water throughout the day, white tongue might be caused by certain medications that make you more likely to get dehydrated. For example, some diuretics can cause unpleasant side effects such as bloating and headaches because they remove too much fluid from the body to lower blood pressure or treat heart problems. Other medications directly cause bad breath by drying out the membranes inside the mouth.
If you have white tongue because you haven’t been drinking enough water, try to up your daily intake of fluids, even going from half a glass of water per day to three full glasses will help.
