New dentures are made to fit properly, but as the tissues in your mouth change over time, your dentures will need to be adjusted, relined, and eventually replaced. A new denture often requires adjustments to relieve sore spots that may have developed while you’re becoming used to it. We can often make these adjustments right here in our office. Over time, however, the fit of your denture will change noticeably. The main reason is that the bone in your jaw continually shrinks when natural teeth are missing. In fact, during the first three years, it’s not uncommon to lose 40 to 60 percent of the jawbone. In addition, some habits, such as sleeping with dentures or grinding and clenching, can accelerate the shrinkage.