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Bone-like enamel and dentin are physical bacterial barriers. Sulcular fluid has antimicrobial properties (contains immunoglobulins) and flushes the sulcus (crevice area between gumline and neck of a tooth). Pulp does not have particular antibacterial properties.
The periodontal ligament is the attachment between a tooth and the bone, and the cementoenamel junction is the transition between the crown and the root.
