CBS News on MSN: Patients of Philadelphia dentist urged to test for HIV and hepatitis, Smiles at Rittenhouse Square closed

Patients of the Smiles at Rittenhouse Square clinic are being urged to get tested after possible exposure to hepatitis and HIV.

Patients of Philadelphia dentist urged to test for HIV and hepatitis, Smiles at Rittenhouse Square closed

The license of a dentist at Smiles at Rittenhouse Square has been suspended due to 'unsanitary practices,' health officials say.

The Philadelphia Inquirer on MSN: Smiles on the Square dental patients should get tested for HIV, hepatitis, health department says

Smiles on the Square dental patients should get tested for HIV, hepatitis, health department says

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A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses delight, sociability, happiness, joy, or amusement.

While we tend to associate smiling with happiness, smiling is actually a complex gesture that can express a wide range of emotions like agreeableness, attraction, discomfort, and disdain. If you’re curious about all the different types of smiles people make and what they mean, keep reading!