Yeah, ours are red too! We got them for Heather last year when she went to the vet - he said she wasn't brushing properly (and gave me a stern lecture on a teenager not having learned properly... hey I wasn't around at the age to teach that stuff!) She had to chew them nightly for about a month before she brushed until she did it for a few days without seeing any pink! LOL The dentist gave us them, so I have no idea where they came from.