How Often is a 2nd Treatment of a Fractional CO2 Laser (UltraPulse) Necessary?

I am a 42yr. old woman. I had my entire face resurfaced with a Fractional CO2 Laser (Ultra Pulse) about 9 months ago. Although my overall result is definitely improved, there are a couple of areas on my face, that didn't meet my expectations. Those areas are under my eyes, where there are still lines and creping of skin, the pores on my checks beside my nose, and my "smile" lines. Is it best to "spot" treat these areas with a 2nd treatment, or would it be best to treat my entire face again?

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