Colgate Colgate Oral and Dental Health Resource Center

Innovative toothpastes to clean and brighten every type of smile.


A toothbrush for every type of smile, designed with comfort and results in mind.


Colgate kids' products make brushing fun and encourage routine use.

Kids' Products

Oral care products available exclusively through dental professionals.

Products From the Dentist

Professional grade oral care, available without a prescription.

Other Oral Care

Every smile is unique and requires a different type of care. Colgate has a solution for every smile.

Search by Benefit
Font size


What Are X-Rays?
What You See on an X-Ray
More About X-Rays

What Are X-Rays?

X-rays are a form of energy that travels in waves. X-rays can enter solid objects, where they either are absorbed or continue to pass through. X-rays tend to be absorbed by denser objects. They pass easily through less dense objects.

Teeth and bone are very dense, so they absorb X-rays. X-rays pass more easily through gums and cheeks. That's why cheeks and gums appear dark and without detail on a dental X-ray, but teeth show up much lighter. Restorations such as crowns and fillings are even denser than bone. They show up as solid, bright white areas on X-rays. Dental decay and caries (cavities) appear as darker patches.

What You See on an X-Ray


More About X-Rays

©2002-2013 Aetna, Inc. All rights reserved.


Related Articles

See Also:

Related Videos

How to Brush

How to Brush

Learn the technique recommended for the best cleaning.

Related Guides

Good Oral Health at Every Age

Good Oral Health at Every Age

A guide to your child's dental development, from birth to 18.

Related Products

Oral & Dental Care and Conditions Categories  |  |  Legal/Privacy  | Site Map  |  Contact Us
© Colgate-Palmolive Company. All rights reserved.
You are viewing the United States site.