A dry tongue after waking up in the morning may be related to high blood sugar levels, which can be controlled. Some oral problems can also lead to a dry tongue, so you need to maintain good oral hygiene habits. If the dryness of the tongue does not improve, you can also go to the relevant dental hospital for a specific examination. In addition, liver and kidney problems are also an important cause of dry tongue in the morning, which can be checked by ultrasound and blood tests.