Invisalign  and clear retainers are new systems of straightening teeth without the use of conventional braces. A series of clear plastic aligners are utilized to create tooth movement. Moving teeth with removable aligners is not new. However, the computer program, which can generate a series of aligners with small changes is the new part. Invisalign is recommended for orthodontic situations with mild to moderate spacing or crowding. They are virtually undetectable, easy to use and comfortable to wear. There are many instances, however, that do not allow for the use of these appliances, and if compliance is a factor, other considerations must be addressed as they need to be worn 24/7 in order to work properly.