Carl Cha tfield is a certified Project Management Professional (PMP) with extensive knowledge of Microsoft Office Project as well as specific usability issues. Timothy Johnson has previously worked as an Office Project support professional for several years. Tim possesses in-depth technical knowledge about the software.
The complete set of primary teeth is in the mouth from the age of 2 Â½ to 3 years of age to 6 to 7 years of age. Other primary tooth eruption facts: A general rule of thumb is that for every 6 months of life, approximately 4 teeth will erupt.
Teething facts. 1  Teething is the process by which a baby's teeth erupt, or break through, the gums. Teething generally occurs between 6 to 24 months of age. 2  Symptoms of teething include irritability, tender and swollen gums, and the infant wanting to place objects or fingers into the mouth in an attempt to reduce discomfort.