Actually, a white coating on the tongue is not directly related to HIV. In most cases, a white tongue is considered likely due to indigestion, or possibly due to inflammation in the mouth, and there's generally no need to worry too much. If you are concerned about HIV infection, you need to go to a hospital for further testing of HIV antibodies to rule it out. It is advised to rest more, avoid spicy and stimulating foods in your diet, refrain from unclean sexual activities, and avoid frequent sexual activities. This can effectively improve some symptoms and prevent the occurrence of HIV/AIDS.