It has been my experience that the number of original treys that you have from Invisalign treatment is usually two to three times the number of Invisalign refinement treys that you will receive. In other words, if you start with 20 Invisalign trace initially, the refinements would have be any where between 7 to 10 trace. Of course, this depends on each specific patient’s malocclusion as well as the severity of crowning pretreatment. Our goal in Invisalign treatment is to get the majority of the movements with initial treys and then the smaller movements with the refinement treys. Hence, most of the time, we are able to do this in 10 treys or less.