How will I know if they are doing the Zerona treatment the right way? (Photo)

How will you know if they are doing the zerona treatment the right way? Are there certain strokes or time that one session is? Will this help with lower belly for people who had 2 c-sections to make skin be firmer n reduce the look of the pouch? If you do zerona do they normally just concentrate to one body part per session and is adding another part an extra fee? Will it also reduce stretchmarks?.thank you!

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