A separator can come out by itself, if it has made enough space between your child's teeth.
They can also come out if your child plays with them with their tongue or fingers. Sticky foods and chewing gum may also cause a separator to come out. If your child does lose a separator, find out if there is adequate space for the orthodontic bands by flossing between the two teeth. If the contact is tight and the floss gets stuck, the separator hasn't made adequate space. You will need to get have them replaced before their band fitting appointment.