The two "things" to be connected are: carbon nanotubes; toiletries
The first idea that came to me was whether could be used coat toothbrush bristles with nanobristles. These nanobristles would potentially need to be fibres made of multiple nanotubes in order to reach a size and strength that would be useful in removing tartar, etc.
Another interesting thought, though not really an idea as such, is that carbon nanotube synthesis could become cheap enough that disposable items such as toilet paper would be made out of it. Carbon nanotube toilet paper could be engineered to be lighter (saving fuel in transportation), stronger, more absorbant, etc. And potentially engineered to degrade after a specified time to reduce the environmental impact of waste.