Quote Originally Posted by slleipnir
It doesn't seem to "scrape off". And on the back of the front teeth, it almost feels like there is something in between my teeth, which is annoying. It was there the last time I went to the dentist and they just told me I needed to floss more (didn't mention the spots/stains/whatever they are)
The dentist uses specialized tools to scrape the tartar off. It's not something you could scrape off with a fingernail or anything, and you don't want to use anything else, so you don't damage the tooth's enamel.

Ask your dentist if you should be using a tartar-control toothpaste when you go.