When kids start to lose their teeth. Paediatric dentist Clive Friedman, of London, Ont., agrees with Dr. Google—mostly. He says that kids usually start losing teeth anytime from five to seven years old, but having wiggly teeth as young as age four is still considered normal. “If a child loses a tooth early, my first question is whether she’s had any trauma, such as a fall, that you’ve not been aware of.