Invisalign is a series of clear aligners that are used to straighten crowded or close unwanted gaps between teeth.  Each aligner is usually worn for 2 weeks before the next aligner is worn.  Clear aligners allow patients to maintain their smile during treatment and the ability to remove the aligners when they eat, brush and floss their teeth unlike conventional braces.  While there are some cases when Invisalign is not the best option for straightening teeth, it has become a great option for those who do not want the hassle of metal braces.