I'm not advocating the product, just pointing to the offer …
Visit the site, click on the link, and they'll tell you what you need to do to get the sample. (Sending them a self addressed, stamped, A4 size envelope for a 24g sample)
White Glo toothpaste - free sample
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Sorry, not 100% free. You have to send them the stamped, self addressed envelope first.
So there is postage.