Normal Variation in Teething: The first primary tooth typically erupts between 6 to 12 months of age. Some babies may not get their first tooth until they are 12 to 14 months old, which can be considered within the normal range.

Delayed Teething: This can be due to various factors such as genetics, nutritional deficiencies, or certain medical conditions. It's a common reason for late tooth eruption.
Hypodontia: A condition where one or more teeth fail to develop. It's relatively common and can be part of the normal variation in tooth development.
Environmental Factors: Such as poor nutrition, exposure to certain chemicals, or maternal health issues during pregnancy, which can affect tooth development.

Hypoparathyroidism: A rare condition where the parathyroid glands are underactive, leading to various symptoms including delayed tooth eruption. Missing this diagnosis can lead to severe health complications.
Rickets: A condition caused by vitamin D deficiency, leading to softening of the bones and potentially affecting tooth development. Early diagnosis and treatment are crucial to prevent long-term health issues.
Cleidocranial Dysplasia: A rare genetic disorder affecting bone development, including teeth. It's essential to diagnose this condition to provide appropriate dental and orthopedic care.

Ectodermal Dysplasias: A group of rare genetic disorders affecting the development of teeth, hair, nails, and sweat glands. These conditions can significantly impact the quality of life and require specialized care.
Dental Agenesis: A condition where teeth fail to develop, often associated with other genetic syndromes. It's essential to identify the underlying cause to provide comprehensive treatment.
Osteopetrosis: A rare genetic disorder characterized by increased bone density, which can affect tooth eruption. Early diagnosis is critical to manage the condition and prevent complications.