What's the difference between Colgate Total Gum Defense toothpaste and regular Total?

I was in the pharmacy recently and saw that Colgate has added a Total Gum Defense line extension to its already large set of Total products. But this product makes exactly the same set of claims as the regular Total --"Helps prevent: Cavities, Gingivitis, Plaque. Fights Tartar, Freshens Breath, Whitens" --and lists the same active and inactive ingredients. Then yesterday I was at the dentist's office, where there was a big basket of Total Gum Defense samples. I asked a periodontist there if there was any difference and she said, "Not as far as I know."I poked around the Colgate website and couldn't find any differences mentioned there. (Could be hiding somewhere but it wasn't apparent.) I did find it instructive that the site lacks the ability to compare the various Total products head-to-head, probably because the main differences are how they're positioned to the market rather than anything substantive.Finally I called Colgate customer service to ask my question. Judging from how quickly they came up with an answer, this is clearly a question they've been receiving a lot. The rep pointed to two differences:

• The formulation is milder --using a different type of hydrated silica
• The flavor is less minty --presumably making it more tolerable for those with sensitive gums

I guess it's enough of a difference to be plausible, and maybe labeling regulations prevent them from being more explicit. But my guess is that Colgate Total Gum Defense is just a typical consumer product line extension, designed to grab a little more shelf space, appeal to a few more consumers, maintain price premiums, and keep generics at bay.