Changing trays every week?

I was told by my ortho's assistant to change my trays every 7 days. On a scale on 1-10 and 1 be having perfect teeth alignments and 10 being the worst, I'd say mine is about a 6. Could that maybe be the reason why I am able to change every week? I am quite worried since I have been reading Q&As and most recommend changing every 2 weeks and specified that it would cause root problems if you change trays a bit earlier.

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