The importance of properly brushing your teeth at least twice per day can’t be overstated – it’s your best defense against plaque, cavities and tooth decay. That said, there is such a thing as too much brushing, as well as brushing too aggressively. Over-brushing can cause the tooth’s protective enamel to wear down, and can also result in a receding gum line which can expose the roots and lead to even more oral health problems.