Yes you should definitely visit a dentist for a proper clinical examination and also, these problems can have local as well as systemic causes..... you might have been prescribed broad spectrum antibiotics for your stomach infection because of which some good bacteria also get reduced in number, affecting the microflora of the mouth..... you need to maintain your hydration level by proper fluid intake..... you should clean your tongue with your toothbrush regularly ..... with proper diet and oral hygiene maintenance, this problem can be reduced to a great extent..... nonetheless, as previously mentioned, a visit to the dentist will be more useful.... Regards....

Your oral problem may quite likely be related to your stomach problem, further details on which shall be helpful. There are common conditions like GERD, in which oral lesions manifest. Also, multiple repurcussions on oral health from gastric disease may occur- like oral and gastric ulcers- H Pylori bacteria induced or otherwise. An "Oral Medicine" specialist is best suited to diagnose your problem based on comprehensive check up, correlation with gastric disease and relevant investigations. Treatment goals can then be formulated. Best Dr. Aditya Patney