Hypothyroidism can be either congenital or acquired. Congenital hypothyroidism is the most common endocrine disorder. There are so many signs and symptoms which are suggestive of hypothrodism like dwarfism, late development of secondary sexual character and impacted teeths. The early treatment of CH patient’s has successfully improved the prognosis and management of this disorder. Optimal treatment and management throughout the patient’s life, beginning in the neonatal period, are required to ensure long-term health. Due to increased awareness of early clinical signs and introduction of neonatal screening for congenital hypothyroidism, long-term untreated hypothyroidism has become rare. In this case, it was described a case of acquired hypothyroidism that was not present  during  pregnancy and later normal baby developed severe dental anomalies, growth and mental retardation.
Key words- Acquired Hypothyroidism, Dental anamoly, Mental retardation.