James Frizzell, DDS, is a graduate of the University of Toronto. Dr. James Frizzell has spent nearly 28 years as a dentist and owner of a Niagara Falls, Ontario, dental practice. In his position with the Niagara Falls-based practice, James Frizzell, DDS, offers services as diverse as in-office whitening systems to taking care of children’s first teeth. Infants typically grow their first teeth between six and 10 months old. The central and lateral incisors of the lower jaw are almost always the first teeth to erupt from the gums, followed by the upper incisors. Second molars, both upper and lower, are generally the last teeth infants deal with as part of their painful teething process. Infants have generally finished developing their baby teeth by three years of age. Children begin to lose their baby teeth and grow permanent teeth in essentially the same order, beginning with lower and upper incisors and moving out to the molars. On average, teeth start falling out at the age of six. How long it takes for an individual to lose all baby teeth varies from one child to the next, but the process is generally complete by age 12.