A cavity is a hole in a tooth that develops from tooth decay. Cavities form when acids in the mouth wear down, or erode, a tooth’s hard outer layer (enamel). Anyone can get a cavity. Proper brushing, flossing and dental cleanings can prevent cavities (sometimes called dental caries).
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What causes cavities?
Many factors play a role in the development of cavities. These steps typically occur:
. Bacteria in the mouth feed on sugary, starchy foods and drinks (fruit, candy, bread, cereal, sodas, juice and milk). The bacteria convert these carbohydrates into acids.
. Bacteria, acid, food and saliva mix to form plaque. This sticky substance coats the teeth.
. Without proper brushing and flossing, acids in plaque dissolve tooth enamel, creating cavities, or holes.
Tooth decay on the outer enamel surface doesn’t usually cause pain or symptoms. You’re more likely to experience symptoms as decay progresses into the dentin and root. Signs of cavities include:
. Bad breath or a bad taste in the mouth.
. Bleeding gums or other signs of gum disease.
. Facial swelling.
. Toothache or mouth pain.
. Tooth sensitivity to hot or cold foods or drinks.
. Redness around or inside the mouth.
Tooth decay can happen at any age, although cavities are more common in children. They may not brush properly and consume more sugary foods and drinks.
Adults also get cavities. Sometimes, new decay develops around the edges of cavities treated in childhood. Adults also are more likely to have receding gums. This condition exposes the lower parts of teeth to cavity-causing plaque.
Tooth decay can affect all layers of a tooth. It can take three years for a cavity to form in the strong outer layer of tooth enamel. Decay progresses more quickly through the dentin (middle layer) to pulp (innermost layer). Pulp contains a tooth’s nerve endings and blood supply. Types of tooth decay include:
. Smooth surface: This slow-growing cavity dissolves tooth enamel. You can prevent it — and sometimes reverse it — with proper brushing, flossing and dental cleanings. People in their 20s often develop this form of tooth decay between their teeth.
. Pit and fissure decay: Cavities form on the top part of the tooth’s chewing surface. Decay also can affect the front side of back teeth. Pit and fissure decay tends to start during the teenage years and progresses quickly.
. Root decay: Older adults who have receding gums are more prone to root decay. Gum recession exposes the tooth’s root to plaque and acid. Root decay is difficult to prevent and treat.
Certain factors increase your risk of cavities:
. Conditions like Sjogren’s syndrome, or medications like antidepressants, that cause dry mouth.
. Consuming sugary, starchy foods or drinks and snacking between meals.
. Family history of cavities.
. Previous radiation therapy to treat head and neck cancer.
. Receding gums.
Twice-a-year dental checkups are the best way to catch cavities early when your dentist can save much of the tooth. Your dentist will use various instruments to examine your teeth. A tooth with a cavity will feel softer when your dentist probes it. You may also get dental X-rays. X-rays show cavities before the decay is visible.
Proper oral hygiene, including regular brushing and flossing, can get rid of plaque and acids that cause cavities. Good teeth and gum care includes:
. Tooth-brushing with a fluoride toothpaste at least twice a day, and preferably after every meal.
. Cutting back on sugary, starchy foods and drinks.
. Daily flossing to get rid of food and plaque stuck between teeth.
. Dental checkups at least twice a year.
. Dental sealants to protect the top chewing surfaces of teeth.
When tooth decay goes untreated for too long, you can lose a large portion of the tooth and need an extraction. Advanced tooth decay can lead to a severe infection inside the tooth and under the gums (tooth abscess). This infection can spread throughout the body. Rarely, infection from a tooth abscess can be fatal.
More than 80% of people have at least one cavity by the time they enter their mid-30s. Cavities are one of the most common chronic diseases that affect all ages.
Treatment depends on the severity of tooth decay. Cavity treatments include:
. Fluoride: When decay is caught early, fluoride treatments can repair tooth enamel. This process is called remineralization. You may need prescription toothpaste and mouthwash, as well as fluoride treatments at the dental office.
. Fillings: Once a hole forms in the tooth, dentists drill out the decayed material and fill the hole. Dental fillings are made of silver amalgam, composite resin or gold.
. Root canal: A root canal treats pain from root decay. Endodontists are dental specialists who treat problems that affect a tooth’s root. During a root canal, this healthcare provider removes the pulp that contains nerve endings that cause pain.
. Tooth extraction: If a root canal isn’t possible, your healthcare provider may extract (pull) the tooth. You may need a dental implant to replace a pulled permanent tooth. Implants keep teeth from shifting and changing your appearance and bite.
Most people with cavities don’t experience any long-term problems. Because cavities develop slowly, it’s important to get regular dental checkups. Fluoride treatments can stop tooth decay in its early stages. Once tooth decay advances to the root, you risk losing the tooth or developing a painful abscess (infection).
You should call your healthcare provider if you experience:
. Bleeding gums.
. Difficulty chewing.
. Signs of infection.
. Swollen face.
. Toothache or mouth pain.