Children have a pretty big window when it comes to losing teeth. While most of them will lose their first tooth around 5 or 6, it’s possible that they can lose a tooth as early as 4, or as late as 8. So yes, there’s a 4-year window where that first (potentially traumatic) event. Given that most kids lose their first tooth between the ages 5-6 however, there’s a pretty good chance they can lose the tooth during school hours. So what do you do?