Hiya, do you mean as in aftercare?
If so, it is to increase the longevity/benefits of the treatment, to avoid any contra actions, and reassure the client that you actually care and are interested. You may be on "on target earnings" or commission only, which may also assist with product sales and/or getting repeat custom.
Create an aftercare leaflet for each module you do, that way it will get drummed into you and you can give it to your clients, too.
Ummm.. if I remember anything else, I will update!
Hope this helps!
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