As e-age it becomes more difficult. On the enamel surface is changing a continuous circulation of mineral.
The longer melting, these saliva-mediated natural process is exposed, the more resistant it is left to decay. After 20 years of dental enamel was remineralized and the organic material it contains is initially lost. This may explain why the majority of new occur carious lesions in children and adolescents.
The salivary glands Immune System