The eruption process of teeth, also known as teething, is divided into stages and occurs over several years. It involves primary or baby teeth and permanent or adult teeth.

By age 3, most children have a full set of 20 primary teeth. The lower front baby teeth appear at about 6 months.

The permanent teeth begin erupting at around 6 years, with the lower front teeth and first permanent molars. The primary teeth are generally lost by about 11 years and the second last permanent molars erupt at about 12. The wisdom teeth are the last to appear, later in the teen years.

Understanding the eruption process can help manage and anticipate dental development in children.