I've just seen what you mean regarding Antos toothbrushes on viovet, so I'm a little confused, but looking on the Antos website although they do not have an ingredients list they show their algae Eurostar chews which look like a pale green colour (like this
Algae Eurostar Assorted Large (26.5cm) - Antos - 100% Natural Dog Treats & Chews since 2004 EDIT - looking around on the Internet and they used to do a toothbrush one which were this pale green colour
Buy ANTOS ALGAE TOOTHBRUSH 50'S Online at Pets Direct).
Someone else may know for sure what the Antos green ones ingredients are.