A tooth makes its appearance in the oral cavity usually when one half of the root is completed

permanent maxillary First molar teeth normally has four root canals

The primary canine is usually exfoliated between the ages of 10 and 11 years

The primary teeth begin to form in utero at about six weeks. Hard tissue formation occurs in all primary teeth by the 18th week in utero. 3. The permanent teeth begin to develop at approximately four months of age in utero. Maxillary and mandibular first molars begin to calcify at birth.

madibular first molar normally have 3 root canals