Why does the tooth structure become black and sometime become yellow when there are dental caries?

See your dentist !! When dental decay is visible to the naked eye the decay has traversed the tooth and a visit to the dentist is needed. Prior to actually visualizing the black or yellow decay, a radiograph and or visual examination by the dentist can pick up incipient lesions.
Tooth Decay. The cavity in the tooth catches food products, bacteria, and sometimes the tooth itself attempts to repair/slow down the decay by laying down tertiary, sclerotic dentin. Any of these can cause discoloration of the teeth.
Infected. Dental decay is bacterial infection of the various tissues that make up normal tooth anatomy. Some bacteria produce discoloring pigments. Some destroy tooth material. Don't wait, see your Dentist now before your faced with systemic spread of the infection.
Carious dentin. The dark shadow that can appear under the enamel when the tooth is wet is decayed dentin. The tooths surface may even look intact. The yellow under the enamel would most likely be healthy dentin.
Destruction of. enamal creates the color change. See your dentist asap.
Is black, it's worse. Dental caries do not cause the tooth to become black. That usually means the dental root or nerve has been destroyed. Get ye to the dentist - now.
Demineralization. The acid demineralizes the hard structure of the tooth and the extent of damaged tooth structure became evident. Cavities on the front teeth are the easiest to see and will look like a yellow-brown or black spot.
Demineralization. Bacteria like Streptococcus mutans produces acids that leach the minerals out of our teeth causing soft areas called caries. The demineralized tooth can pick up many colors. Off white caries are usually faster moving, causing fast destruction. Black caries are usually slower moving but may have faster moving caries underneath.

Related Questions

What's the cause of presence of black or yellow and sometime even white color of the tooth with dental caries?

Is black, it's worse. Dental caries do not cause the tooth to become black. That usually means the dental root or nerve has been destroyed. Get ye to the dentist - now. If it is white, off-white, very light yellow--sounds normal, unless the surrounding teeth are a different shade. Read more...
Staining. The color of the decay varies depending on the amount of the decay present and where on the tooth the decay is located..The extent of the decay through the enamel will cause different transparencies and thus different colors. Read more...
Decalcified enamel . When a tooth decays the enamel looses calcium and decalcifies and changes color. Read more...
Decay. Caries or decay can be almost any color. When Bactria decalcify the enamel of a tooth and start "eating" the organic materials of the tooth, the by product is an inorganic material that can be most any color. Read more...
Spots? Are these spots or patches, the white color could be due to hypocalcification or low mineral content of the tooth and the causes vary from genetics to sickness in childhood to low or excessive fluoride in the drinking water. The yellow color could be due to plaque or stains and black could be due to dental caries or stains. Read more...

What is the cause of black, even white colored teeth with dental caries?

Decay. The bacteria causes decay which appears black in appearance. See a dentist asap to save the tooth. Read more...
Bacterial action. White spots associated with dental caries (cavities) are areas of the enamel that the bacteria have leached out the calcium. With calcium loss, you get a chalky-white appearance called decalcification.. Black, brown and tan represent the decayed aspect of the cavity. Decalcification can be reversed, decay can only be removed. Read more...

In the classification of dental caries, what class is the caries located on the middle third of anterior teeth?

Class 3. Class 1 - single surface on posterior teeth. Class 2 - involves an inter proximal surface on a posterior tooth. Class 3 - involves an inter proximal surface of an anterior tooth (usually in the middle or incisal third). Class 4 - involves the incisal edge of an anterior tooth. Class 5 - cavity along the gum line. Read more...
One more Class... Class vi - cusp tip caries the doc above is right on, but i thought i'd add class vi for thoroughness. Read more...

Can there be some cure for dental caries without removing the affected teeth?

Yes. There are many procedure to save a tooth with carious lesions: root canal therapy, posts, crowns. These procedures can be performed only if there is enough solid tooth structure present and no periodontal disease. If there is not enough good tooth to warrant the time and expense of the above procedures, the tooth is deemed hopeless and extracted. $$$ can be better spent on an implant in that area. Read more...
Saving teeth. That's what dentists go to dental school for. To learn how to save teeth. From simple fillings to more involved endodontic, periodontal and restorative procedures. It's amazing what can be done nowadays. But we need our patient's cooperation in order to restore their teeth. At some point however, if the patient doesn't care or won't cooperate, or the tooth is hopeless, we can replace them. Read more...

Will brushing my teeth prevent the spreading of my dental caries?

Absolutely. Oral hygiene is the best way to prevent the spread of caries. Diets low in sticky foods and sugars will help as well. See your dentist regularly for professional cleanings to get those hard to reach spots. Read more...
Good hygiene helps. If by "spreading", you mean, transferring from one tooth to the next, then the answer is yes. When there is active dental decay present in your mouth, then the oral environment is not as healthy as it could be. The numbers of bacteria may increase putting other teeth at risk. Improving oral hygiene will definitely help slow the progression of untreated dental decay and prevent other cavities. Read more...
Tooth Brushing. Yes! brushing can prevent the spread of dental caries. But brushing alone is not enough. You must also add flossing in between your teeth to be able to do a complete job. If you only brush, you are missing 35% of the plaque in your mouth. More than half of all cavities are found between teeth using x-rays. If you already have cavities you need them removed and teeth repaired. Read more...

Can you tell whether it's dental caries or gingivitis by how much pain your teeth hurt?

Pain. Generally no as severe gum disease can be as painful as decay. Your best option is to see your dentist, get a complete examination and diagnosis for a pain free and happy holiday season. Read more...
Usually Yes. Pain can be described as to how it happens. For instance if you drink something cold, it's likely nerve tooth pain. If you floss and it hurts, its likely gingivitis. Read more...
Tooth Pain. You are not able to tell if your dental pain is from your gums or teeth. Denta plain can be very confusing to the patient. Many time can seem to be coming from a lower tooth when in actuality it may becoming from a tooth on the upper arch. Proper testing and x-rays by a dentist is the best way to know where the pain is coming from and to find out what to do about it. See a dentist. Read more...
Yes. Most of the time, gingivitis and gum disease will have no associated pain. If the teeth themselves hurt, it probably is not the gums. Please see your dentist. Read more...
Yes. Caries will cause varying types of pain depending on depth. Sensitivity to sweets, liquids , cold, hot and biting are the usual progression. Gingevitis will cause pain when the gums are brushed, when flossing, and when certain foods come it contact w the gums. And the pain is generalized usually. Read more...