The aim: to analyze diagnostic methods of the pulp status in children and align pulpal diagnoses with international and Ukrainian classifications. Material and methods: The authors searched for articles via Google using keywords such as «pulpitis classification», «pulp diagnostic in children», «reversible pulpitis», «irreversible pulpitis», «pulp necrosis» combined with «primary teeth», «permanent immature teeth». Also evidence of primary data was evaluated by levels of evidence statements and grades of recommendations for questions relating to diagnosis. Results: Level of evidence of primary data about methods of pulpal state diagnosis varies from 2 to expert opinion, grade of recommendation is C-D. Sensibility tests can be used for pulp diagnosing in primary and immature permanent teeth, in conjunction with other clinical diagnostic aids. Such conditions of pulp as complete pulp necrosis, pulpless and infected root canal system, previously treated pulpitis, and previously initiated therapy could be included in the Ukrainian classification. Pulp hyperplasia only partially corresponds pulpitis chronica hypertrophica and may be associated with any form of reversible and irreversible pulpitis. In international classifications, partial pulp necrosis includes pulpitis chronica gangraenosa and pulpitis acuta purulenta from the Ukrainian variant. Conclusions: Pulpal diagnosis in children relies on observation of clinical and periapical radiographic findings. While the Ukrainian classification covers various forms of pulpitis, it could be expanded to include pulp conditions, but only some of them completely correspond diagnoses of the Ukrainian classification. Therefore, the development of new classification of the status of the pulp in children is promising and challenging task.