What's mild demineralization?

Of the teeth, simple: Enamel of a tooth, is a complex set of enamel rods, much like a handful of spaghetti packed tightly together with the ends pointing out to the oral environment. When exposed to acid from bacteria accumulation, ingested drinks, stomach acid regurgitation, or low ph saliva, the ends of the rods shrink through demineralization. The higher the molarity of the acid, the faster. Be concerned about ph.