Gingivitis: Gingivitis is an inflammation of the gums surrounding the teeth. Gingivitis is caused by a bacterial infection of the gums. Symptoms may include pain, redness, swelling, and bleeding of the gums. Treatment includes good dental hygiene and regular dental visits.

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Doctor's Notes on Gingivitis Symptoms

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Bad breath< (halitosis) can be caused by a variety of things including diet, medication, poor oral hygiene, and diseases or conditions such as diabetes, GERD, lactose intolerance, gum disease, and more. Treatment for bad breath depends on the cause.
Dental Abscess

Bacteria from a tooth cavity can cause a dental abscess, or infection of the mouth, jaw, or face. Symptoms include pain, swelling, facial redness, gum inflammation, pus drainage, and occasional difficulty fully opening the mouth. Unless the abscess ruptures on its own, the abscess will need to be cut open and drained by a health-care professional. Dental abscesses can be deadly if left untreated.
Is Gingivitis Contagious

The bacteria that cause gingivitis (inflammation of the gums) may be spread through saliva, which means it is possible – though uncommon - to spread through kissing or sharing eating utensils or oral health equipment with someone who has gum disease.
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Periodontal disease is an infection of the tissues that support the teeth. Teeth are supported by the gums, or gingiva. A tooth's root is anchored to its socket by fibers called periodontal ligaments.
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Toothache or tooth pain is caused when the nerve root of a tooth is irritated. Dental (tooth) infection, decay, injury, or loss of a tooth are the most common causes of toothache. One should call the doctor or dentist when experiencing toothache to receive appropriate treatment.
When to Visit the Dentist

Most symptoms and problems that occur with your mouth, teeth, and gums are not emergencies and usually can wait for an appointment with your dentist. Urgent dental problems include: traumatic injury that cracks or breaks teeth; cuts to the gums or mouth; tooth pain; gum swelling or redness; or jaw pain.

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Dental Abscess Bacteria from a tooth cavity can cause a dental abscess, or infection of the mouth, jaw, or face. Symptoms include pain, swelling, facial redness, gum inflammation, pus drainage, and occasional difficulty fully opening the mouth. Unless the abscess ruptures on its own, the abscess will need to be cut open and drained by a health-care professional. Dental abscesses can be deadly if left untreated.