This study by Gellin showed that permanent teeth growing behind the baby's teeth is a fairly common condition, accounting for about 10% of all children.
Fortunately, many times the shark's teeth will resolve itself, and eventually the baby's teeth will fall off. Sometimes they cannot solve it themselves. So far, less than a year in the dental school clinics, I have seen two patients who are close to 20 years old. Some of their permanent teeth still have baby teeth.
A young woman decided that she might wear a braces because the deciduous teeth hanging in her mouth caused a bit of congestion. Now her teeth are not well aligned. Sadly, she never corrected when her permanent teeth first entered. Most of the time, the dentist can correct shark teeth before they become a problem.
This is a picture of a young boy named Evan. If you look closely, you will find that he has two permanent teeth entering from the bottom, and the two babies' teeth are still nearby. His mother said that Evan had lost one tooth the day after this photo was taken.
