I got the urge to pick it off, so I took my thumb nail, put it right where the tarter ended and the gum began and I gave it a strong pull.
It came apart in two pieces. The Bichon was wondering what the two things were that were suddenly floating in her mouth. Luckily, she didn't eat it. Otherwise, I would never have been able to get this great picture.
Oh yeah, I failed at my attempt to pop the other side which resulted in a chipped nail.