Are cavities serious?

Cavities can become serious if they are not treated property or treated early. A filling helps prevent the cavity from growing and spreading in the mouth, becoming an even bigger problem. It can be possible to lose teeth from decay and cavities.
Left untreated, cavities can become serious. Cavities can cause pain, swelling, infection, and loss of teeth. Losing teeth will lead to a change in your appearance, speech, and eating. An untreated dental infection can spread to the brain leading to death. It is important to see you dentist to have your teeth checked for cavities on a regular basis. If cavities are detected early, your teeth can be saved.
Dante A. Gonzales, DMD
Orthodontics & Dentofacial Orthopedics
Every cavity should be taken very seriously. A cavity, if left untreated, can eventually infect the pulp of the tooth. Once the pulp of the tooth is infected, root canal therapy and a crown may be needed in order to save the tooth. If a cavity is detected by your dentist early, then the treatment needed may only be a small filling. Early detection and treatment are important. 
Yes they are. A cavity is an infection of your tooth. When cavities are just forming, they are often painless, and most people are unaware that they even have them. When they become deeper, the teeth can become sensitive to hot and cold. A very deep cavity that reaches the nerve can cause a painful toothache that would require a root canal or extraction of your tooth.
Peggy Rosen
Having cavities or dental caries in your teeth are the beginning of serious problems. The main factors controlling the risk of dental caries are dental hygiene. Researchers found links between the health of your mouth, teeth and gums to overall health and well-being.

Systemic conditions that may be linked to oral health: Endocarditis, stroke, eating disorder, immune system disorder, etc.

Having cavities impact the ability to chew efficiently which is essential for obtaining nutrition from foods. People who have poor dental health tend to have poor nutrition also.

If detected and treated early, cavities are not serious. All early cavities can be treated with fluoride treatments or fillings. Cavities are only serious if the tooth decay progresses to the inner part of the tooth or the root. In this case, a more severe treatment, such as a root canal or tooth extraction may be necessary to stop the pain. Cavities can lead to some serious complications such as tooth loss, infection, or problems with chewing.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.