<s>[INST] Hi, the roof of my mouth has been itching randomly lately, I thought it may be a food allergie but it also happens when I havent eaten anything. I havent been brushing my teeth all that much recently and my breath is really bad. Is it more likely an infection or could be a dangerous allergy? [/INST] Hello, Welcome to Chat Doctor, The symptoms which you are having is may be due to the infections or allergic to some daily used products. Oral cavity will have the lot of organisms and these organisms are kept under control by the good organisms, whenever there is a change in the environment these organisms will multiply and produces their symptoms. To Know whether there is any allergy in the body you have to test for absolute eosinophil count (AEC), which will be increased in any allergic reactions. If the AEC is increased you can undergo skin prick test to find out the allergen which is causing all these symptoms. I would suggest you to follow1. Maintain good oral hygiene2. Mouth wash with chlorhexidiene mouth wash3. Mltivitamin for 1 monthThank you. </s>