Knocked out teeth are most often sports-related injuries. Wearing a mouthguard when playing sports can protect the teeth from trauma. There are mouthguards that can be purchased and molded to the child’s teeth, but having a custom mouthguard made by your dentist will be more effective. Custom dental mouthguards are made directly from impressions of the teeth. These fit better for more effective protection. A mouthguard that doesn’t fit properly can cause damage to the teeth and is also less comfortable. The more comfortable the mouthguard is, the more likely the child is to wear it without complaint.