What is the main cause of caries?

The bacteria contained in the dental calculus affect different people in different ways. Some organisms practically cannot resist the ruinous influence of the bacteria while other people will observe caries much later. The ability to resist the carious disease depends on the condition of the persons immune system and additional factors (diseases) that ruin the immune system. It is a scientifically proven fact that people with weak immune system are more prone to caries. For example, if a child has rachitis or diathesis exudativa caries will develop twice faster comparing to the development of caries of a healthy child. It is important to pay attention to the composition and properties of saliva. People who are more prone to carious disease have viscous saliva. The mineral salt content is changed.