All teeth have roots, and canals within these roots. Different teeth have a different number of roots and canals.
Front teeth (incisors and canines) have 1 root and 1 canal. Side teeth (premolars) have 1-2 roots and 1-2 canals. Rear teeth have 3 roots and 3-4 canals (upper molars), or 2 roots and 3-4 canals (lower [...]