Figure 1. Scanning electron microscopy of the root canal wall before and after infection with Enterococcus faecalis (×1,000 and ×10,000); (a–c) the wall before infection under ×1,000 magnification; (d–f) the wall after infection under ×1,000 magnification; (g–i) open dentinal tubules without bacteria before infection under ×10,000 magnification; and (j–l) open dentinal tubules with bacteria growing after infection under ×10,000 magnification.