The most common medical conditions indicating the symptoms like dry mouth
and metallic taste
in mouth due to
Side effects of medicines
Inflammation in gums called gingivitis
Follow these suggestions
1.self check your oral cavity completely if you found any abnormality consult a dentist
2.drink plenty of water and fresh juices if you are a diabetic avoid fresh juices instead drink veg soups.
3.have soothing diet.
4.avoid eating non veg, spicy foods, junk foods.
5.check your bowel movement.
6.avoid smoking and alcohol.
After strictly following these suggestions if symptoms persists consult the doctor for further evaluations.
Hope this answers your query and if any more clarifications be free to post.