Dental care
Learning Center
COVID-19: Long-term effects
Learn about the possible long-term effects of COVID-19.
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
Different types of COVID-19 vaccines: How they work
Find out how different COVID-19 vaccines cause your body to create antibodies that will fight the COVID-19 virus.
Facial fillers for wrinkles
Find out more about facial injections, also called soft tissue fillers, that can temporarily smooth wrinkles.
Intraoperative magnetic resonance imaging (iMRI)
Find out how neurosurgeons use intraoperative magnetic resonance imaging (iMRI) during brain surgery.
Blood in semen
Finding blood in your semen can be alarming, but the cause is usually benign. Find out possible causes and when to see a doctor.
Bent penis
Learn what can cause a curved erection and when you may need to see a health care provider.
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