First off, normally with Invisalign you change your aligner every 2 weeks, which would only mean 5 months for you given the 10 aligners needed. Unsure why you're being asked to do it in 3 week intervals..
I always believed the difference between Full Invisalign and express to be the amount of time required for treatment, and the fact that express doesn't always offer the refinement period after your treatment. If you were unhappy with the results after the 10 trays you would then have to pay again to refine your teeth. I would confirm this with your orthodontist though, as some might offer it.


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