Yellowish saliva in the morning, consider food residue, dental disease or cholecystitis and other diseases caused. 1. Food residue: not brushing and rinsing after meals leads to the accumulation of food debris caused by yellowing of saliva, can be treated through dental scaling and other ways of oral hygiene, do not need to worry too much. 2. Dental diseases: when considering dental calculus, plaque and other diseases, you should consult a doctor in time to clean your teeth, but also with the use of sodium bicarbonate solution for local cleaning. 3. cholecystitis: if you consider cholecystitis and other diseases caused by liver and gallbladder dysfunction, usually accompanied by dyspepsia and other conditions, this time you can take anti-inflammatory cholelithiasis tablets, gastrointestinal tablets, etc., and if necessary, surgical treatment. In conclusion, the causes of yellow saliva in the morning are varied, and if there are other diseases such as abdominal pain, toothache, etc., you should consult a doctor for a clear diagnosis. All of the above medications should be used in accordance with medical advice.