Childhood is the period of life's greatest physical, psychological and emotional growth; the child we see today is no longer the same tomorrow. The child patient presents a challenge to the dentist, who must solve the problems of today with an eye to the future and dental health of an adult.Diagnosis is a process by which the practitioner distinguishes one disease from another, differentiates between normal and abnormal, and determines the etiology of abnormal conditions. Diagnosis includes collection of a comprehensive and concise database of pertinent information, sufficient to understand the patient's problem as well as answer questions arising in the treating clinicians' mind. The signs and symptoms elicited on the basis of patient's experiences and clinician's knowledge forms the elementary framework of the disease, with use of conventional and advanced diagnostic aids helps for proper diagnosis and to improve prognosis.