Space Maintainers are needed when a primary tooth is lost prematurely due to decay or injury. The gap left needs to be held open for the permanent tooth to erupt in the correct position. Space maintainers do not guarantee prevention of orthodontic treatment in the future. Plastic teeth may be used to cover the empty space (pedo-partial) at the discretion of the doctor. Space maintainers are cemented in the mouth by temporary cement and may become loose with time. Care must be taken to avoid loss or damage to the space maintainer. Sticky foods such as caramels, taffy, and chewing gum can pull the space maintainer off.