While it's technically *possible* to get into dental school with a GED, it's
extremely rare and highly improbable. Dental schools overwhelmingly prefer applicants with a bachelor's degree from an accredited college or university. A GED, while demonstrating the equivalent of a high school diploma, doesn't provide the depth of coursework and rigorous academic environment typically required for admission. You would need to first complete a rigorous undergraduate program, earning a high GPA, and then apply to dental school. The undergraduate program would need to include all the prerequisites required by dental schools (biology, chemistry, organic chemistry, physics, etc.)
In short, while not explicitly forbidden, using a GED as a foundation for dental school admission would create a significantly steeper and more challenging path. It's far more practical and advisable to pursue a traditional college path.