I try to brush Katie's teeth regularly, although I don't do it as much as I should. Recently I've noticed that she has some sort of buildup on two of her molars. I don't think it's tartar as it doesn't look like the pictures I've seen and she's too young - 15 months - to have that much tartar. It does look like a lighter shade of her toothpaste. Is it possible to have toothpaste buildup? Or am I crazy. We're seeing the vet Monday night, so I'll ask then (as long as I won't sound like a loon).