When a band (ring around the back teeth) comes loose, the patient is in no immediate harm. However, the band is normally cemented on the tooth with an adhesive that seals the inner portion of the band from saliva and plaque. If the band is left loose for a period of time (3-4 weeks), saliva and bacteria may enter the crevice between the tooth and the band. The result could be a decalcification (white spot) on the tooth surface. It can form rather quickly, causing damage to the enamel, so a phone call to our office is recommended.