The dental pulp is the part in the center of a tooth made up of living connective tissue and cells called odontoblasts.The dental pulp is a part of the dentin–pulp complex (endodontium).pical foramen is the opening of the radicular pulp into the periapical connective tissue. The average size is 0.3 to 0.4 mm in diameter. There can be two or more foramina separated by a portion of dentin and cementum or by cementum only.