Several conditions can cause spots or patches of your gums to turn white. These range from more benign causes, such as gingivitis or canker sores, to more serious conditions, like oral cancer.

Medically reviewed by Edmund Khoo, DDS Gum cancer, also called gingiva cancer, occurs when cells in the gum grow out of control, forming tumors or lesions. A common form of gum cancer is squamous cell ...