When you have a cavity, your dentist repairs it with a restorative process that most patients call fillings. The decayed portion of your tooth is removed, and then the remaining space is filled with a substance that bonds to your tooth without compromising the overall health of the tooth. Fillings are the most common dental-restoration procedure.
However, people can make the mistake of thinking that dental fillings last forever. While the replacement portion that fills the gap is hardwearing and long-lasting, it is not the same as the strength of your natural enamel. Fillings do not last forever, and when they do fail, they leave the rest of your tooth open to further decay.