What are common causes of delayed tooth eruption?

Genetics: Genetics plays a major role in tooth eruption, other factors are local in nature such as a traumatic accident to the jaw, a local infection or a childhood disease.

One: One cause could be hypothyroid but....There are many syndromes associated with delayed eruption.

Genetics & hormonal: There are several genetic conditions that result in delayed eruption and development of the teeth. There may be delay of the eruption of teeth if there is a low functioning thyroid, adrenal or pituitary gland. You would probably already know about the more significant conditions. Most of the time it is just that babies schedule and nothing to worry about.

Define delay : The normal range of first eruption runs from birth to 15 months.It is not a standard marker for development, nutrition or hormonal balance. Delay beyond 15 months and failure to have all deciduous teeth by 3 is often genetic.Rarely it will reflect a hormonal issue in older kids but other related symptoms would be evident at the time.