Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Gum (Periodontal) Disease ?
    ### Response:
    Gingivitis is inflammation of the gums. In gingivitis, the gums become red, swollen and can bleed easily. Gingivitis is a mild form of gum disease. It can usually be reversed with daily brushing and flossing, and regular cleaning by a dentist or dental hygienist.
    