What’s wrong with a tooth that’s good on the outside but bad on the inside?

Teeth that are good on the surface and bad on the inside are mainly the cause of remineralization.
The caries of the teeth are found in points, gaps and fissure grooves on the surface of the teeth, which are usually narrow and small and cannot be easily cleaned, resulting in a high incidence of caries. Initial bacterial invasion at the enamel level is usually radiolucent, with small openings but large internal surfaces of invasion.
Therefore, for some patients with slower caries progression, it is easy to happen that the demineralized layer on the surface undergoes remineralization under the action of saliva, but the internal bacteria continue to invade the phenomenon, appearing good on the surface but bad on the inside. It is recommended to remove the carious tissues as soon as possible and fill the treatment.
Good oral hygiene habits is the key to preventing caries, it is recommended to use the correct way of brushing, brushing in the morning and evening, rinsing after meals.