Gingivitis(Gum Disease) :

Gingivitis is the mildest form of periodontal disease. It causes the gums to become red, swollen, and bleed easily. There is usually little or no discomfort at this stage. Gingivitis is often caused by inadequate oral hygiene.

Gingivitis is reversible with professional treatment and good oral home care.

A serious gum infection that damages gums and can destroy the jawbone. Because gum disease is usually painless, you may not know you have it. Also referred to as periodontal disease, gum disease is caused by plaque, the sticky film of bacteria that is constantly forming on our teeth.

Periodontitis

Untreated gingivitis can advance to periodontitis. With time, plaque can spread and grow below the gum line. Toxins produced by the bacteria in plaque irritate the gums. The toxins stimulate a chronic inflammatory response in which the body in essence turns on itself, and the tissues and bone that support the teeth are broken down and destroyed. Gums separate from the teeth, forming pockets (spaces between the teeth and gums) that become infected. As the disease progresses, the pockets deepen and more gum tissue and bone are destroyed. Often, this destructive process has very mild symptoms. Eventually, teeth can become loose and may have to be removed.

signs that can signal a problem:

gums that bleed easily
red, swollen, tender gums
gums that have pulled away from the teeth
persistent bad breath or bad taste
permanent teeth that are loose or separating
any change in the way your teeth fit together when you bite
any change in the fit of partial dentures

Risk of developing gum disease.

poor oral hygiene
smoking or chewing tobacco
genetics
crooked teeth that are hard to keep clean
pregnancy
diabetes