Must I use all 14 treatments

I have the 3D Whitening Strips. My teeth have minimal yellowing and no stains. If I am satisfied with their appearance after 7 treatments, can I just finish the remaining treatments when I notice they are not a white again? And naturally before product expiration or is there a compelling reason to use all 14 treatments within a 30 day period? Thank you for this informative site.

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