This investigation seeks to build upon existing evidence that a relationship exists between body mass and timing and the number of erupted teeth.

Alteration in the order of teeth eruption denotes a disorder in normal development of the teeth, rather than delayed or accelerated growth. The more time deviation of teeth eruption from normal, the more possible the presence of a problem in development of teeth. For these reasons having a non-invasive tool such as body mass index to determine if development will be slower than average, could be helpful to the practitioner.

Inclusion Criteria:

- Healthy infants aged 5-36 months. 2-Absence of medical and congenital diseases. 3-Full term infants. 4-Residents of Cairo governorate.

Exclusion Criteria:

• Presence of natal and neonatal teeth.

Subjects will be selected according to the following inclusion and exclusion criteria:

1. Inclusion criteria:

   1. Healthy infants aged 5-36 months.
   2. Absence of medical and congenital diseases.
   3. Full term infants.
   4. Residents of Cairo governorate.

2. Exclusion criteria:

Presence of natal and neonatal teeth.

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