Directly related:
* Dental: Relating to teeth.
* Dentist: A doctor who specializes in the care of teeth.
* Denture: A set of artificial teeth.
* Dentition: The arrangement and character of teeth.
* Interdental: Located between teeth.
* Dentine: The hard substance that forms the bulk of a tooth.
* Incisor: A front tooth that cuts food.
* Molar: A tooth at the back of the mouth used for grinding food.
* Canine: A pointed tooth located next to the incisors.
Indirectly related:
* Indentation: A small hollow or depression.
* Indent: To make a notch or hollow in something.
* Dense: Packed tightly together; thick.
* Density: The degree of compactness of a substance.
These are just a few examples. There are many other words related to "dens" that you can find in the dictionary.