Can repair be done to chipped/decayed teeth at the gum line? (photos)

In my younger years, I took poor care of my teeth and had a high sugar intake. I have two decayed/chipped teeth at the gum line that I am addressing next month when my insurance begins. I am concerned that this isn't a small fix. In general, what would be the method(s) of repair and is the repair expensive? Regardless, I will be addressing the issue. I would just like some insight while I'm waiting to see a dentist. I am ashamed that I did not see this has a priority in the past.