Owen is about 6 1/2 months old now and I've been attempting to brush his teeth - but he really hates it. The other day I noticed a thin line of brownish stains on the side of both of his back molars, in the crevises. Is this tooth decay? I'm surprised because he's still a puppy and I see some of his other teeth are still growing in. I tried to brush it off but it won't come out. I tried rubbing it off with a Qtip, but that didn't work. I'm just wondering if I need to bring him to the vet to get his teeth cleaned/worked on or if it's just a stain (possibly from his kibble?) that'll go away. Yesterday I started to switch his dinner meals to a raw diet, so hopefully that'll reduce the buildup. Let me know what you guys think - Thanks!