You have to sign up to be part of the SampleSocial application on Facebook..

First update your profile settings. After your profile you will click "Review and Set Permissions" and complete that section. You will then get the message "Your details have been updated successfully!" and "Now that you are ready to go, you can:
View the available samples."

"Stim-U-Dent is clinically proven better than flossing and better than the prescription rinse Peridex in reducing gingivitis."

Stim-U-Dent Mint Plaque Removers Sample