Had this during my last pregnancy. Really hideously strong craving for toothpaste. If it wasn't harmful I would honestly eat it, genuinely find myself day dreaming about being allowed to.
Worryingly today whilst cleaning the kitchen I started subconsciously thinking that something smells good to eat, when I zoned into what I was thinking about I realised it was the bleach smell. The chlorine swimming pool sort.
My iron levels are fine, happy healthy pregnancy. Anyone else get this? And more importantly is there anything I can eat that tastes like toothpaste? Gum doesn't cut it, and Trebor XXX are the closest I can get to toothpaste taste but it's not cutting. All the other mints advise laxative effects if you eat too many 
It's driving me mad. My teeth are very clean though unsurprisingly.