After HIV infection, as immunity decreases, various opportunistic infections will occur. Nine common oral symptoms: 1, hairy mucosal white spots are a distinctive feature of HIV-infected patients, usually on both sides of the tongue, as white fluffy white spots that cannot be easily erased. 2, oral candidiasis, with mostly removable white mucosal or red lesions. 3, Kaposi’s sarcoma, showing light blue and dark red plaques. 4, necrotizing gingivitis, with interdental papillae destruction and fibrinous necrosis. 5. necrotizing gingivitis, with destruction of interdental papillae and fibrinous necrosis. 5. periodontal disease, periodontal soft tissue damage. 6. salivary gland disease, swelling of the salivary glands. 7. herpes simplex stomatitis, which may present with blistering symptoms. 6. common warts, which may present with oral mucosal hyperplasia. 9. heavy mouth sores, which may present with skin ulceration. Other oral diseases such as herpes labialis, herpes zoster, chickenpox, non-specific oral ulcers, necrotizing ulcerative stomatitis, thrombocytopenic purpura, non-Hodgkin’s lymphoma and many others may also occur.