There's also an issue with domain names, where using the trademark owner's brand name as part of the domain may get you UDRP'ed. The early cases are dealing with a Mercedes parts reseller vs. Mercedes, and also (IIRC) a used tractor dealer.
The Mercedes one, the reseller won the first time around and lost the second time around. IIRC, he won the first time because he was selling genuine manufacturer parts, and lost the second time because he'd started selling either refurbs or aftermarket parts in addition to the genuine Mercedes parts.
The tractor dealer won, but only because the domain name was clear about him selling USED tractors. I doubt you'll be selling genuine pre-owned Gillette blades. :-)
Just an FYI in case your business model would turn on owning a domain name that would be easy for people to associate with the brand.