What are the factors that cause dental caries?

Caries is invading our lives, dental caries is a chronic disease, but also a bacterial infection, we have to bacteria, food, host, time these four aspects to prevent dental caries. Protect our teeth, smile face every day. So, the following for everyone to tell us about the factors that lead to dental caries.
One, bacteria

People's mouth is a huge bacterial library, these bacteria are mostly conditional pathogens, if the oral environment is clean, they will not be pathogenic, if the oral cavity often stuck caries food, it will form plaque on the surface of the teeth, Bacteria mainly with plaque adhesion to the tooth surface, dental plaque is the bacteria in the tooth surface of the caries an important environment, with such an environment, the original conditional bacteria become a pathogen.
It is generally believed that there are two types of cariogenic bacteria, one is the acid bacteria, mainly Streptococcus mutans, actinomycetes and Lactobacillus, carbohydrate decomposition can produce acid, resulting in tooth mineralization demineralization; another Species is Gram-positive cocci, can damage organic matter, after a long period of time can make teeth forming cavities.
Second, food
Mainly carbohydrate foods such as sucrose, glucose and refined rice noodles. Bacteria can use sugar to produce acid and corrosion of teeth. Sugar can promote the adhesion and accumulation of bacteria in the tooth surface, and for the growth of bacteria, metabolism to provide nutrition. Therefore, sugar and carbohydrates are the basis of the occurrence of caries.
Third, the host
Mainly refers to two aspects. One refers to the body's physical condition, immune function, oral health is good, is not conducive to the survival and reproduction of bacteria.
Second refers to the quality of the teeth, including the shape and structure of the teeth. Teeth itself is not calcified, poor surface finish, irregular arrangement of teeth, crowded, overlapping, etc., are conducive to bacterial and food residues, susceptible to caries. Others such as inheritance, nutrition, minerals, endocrine on the host's anti-caries also have an impact.
Four time
"Frozen three feet, not a day of cold", from the initial caries to the clinical formation of cavities generally need 1.5 to 2 years, divided into three stages.
The first stage of the caries stage, due to lesions mainly damage enamel, also known as enamel caries. Mainly for the surface of the teeth by the smooth and rough, carious parts of the color becomes dark or dark brown or tooth surface fissure black.
The second stage, said the caries stage, lesions dentin shallow, also known as dentin caries, due to dentin destruction, began to form shallow cavities, cold, hot, sweet, sour food feel sore, when stimulated After removal, the symptoms disappear.
The third stage, said deep caries stage, lesions have reached the dentin deep, also known as dentin deep caries. Due to deepening the expansion of teeth to expand the formation of deeper cavities. When the bacteria and their metabolites through the cavities into the pulp caused by pulpitis, the occurrence of abscess or severe pain.
Above for everyone in detail the factors leading to dental caries, dental caries will not occur within a short time, even if all factors exist at the same time, it will take a long time before it can form dental caries. So the time factor in the occurrence of dental caries is of great significance, early treatment of early rehabilitation.