The other forms of gum disease are linked with certain drugs and medications, certain allergies, skin disease and hormonal changes in women. When a skin disease or an allergy is the cause of gum disease, the tissues may literally peel away from the gums. Like in acute necrotizing ulcerative gingivitis, which is a more severe form of gingivitis, there is an infection in the gums and the tissues starts to die. The gums bleed spontaneously and the cone of tissue between teeth decays and becomes blunted. The decaying substance can cause pains and even produce a bad odor causing the presence of bad breath. Who often gets this form of gingivitis are patients with AIDS. The gums in the front may turn yellowish-gray and recede so much that bone is visible during the advance stages of gum disease.