How come brushing your teeth becomes tooth decay?

well it depend on what brand you use... like caotegate, or the best one you know.

How come brushing your teeth becomes tooth decay?
Your teeth have a protective coating called enamel that gets scraped off by abrasive toothpastes. The worst is the whitening toothpastes which often contain abrasives to polish...like sand.
Reply:Brushing teeth is good but still depends on what type of brush you use.Toothbrush with hard surface are known for causing tooth decay as the teeth become thin and end up in decaying.