Invisalign lite recommended, dentists says refinements are included?

My dentist has shown me my clincheck and it is the lite treatment. He had said that it my teeth don't respond quickly or the end result shown is not achieved within 14 I can have more trays included in the cost. This seems to contradict a lot of the research I have been shown. Will Invisalign keep going with the Lite until it gets to what they said it would after 14 trays? He said there is no point paying for full as the results would not be any better as my teeth are not that bad.

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