Cavities are caused by bacteria and plaque that accumulates in the oral cavity. When you don’t clean your teeth regularly, tooth enamel can become damaged and a cavity can result. Although cavities start out small, they will get larger over time.
If a cavity is left to progress, it can eventually encompass your entire tooth and cause the need for an extraction or root canal. In some cases, untreated tooth decay can even cause a tooth infection and abscess. Let’s take a closer look at the process of how a cavity forms.
Read the full article here: What Exactly Causes Cavities?