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  1. www.webmd.com › skin-problems-and-treatments › understandingDandruff: What It Is & Why You Get It - WebMD

    2023年4月21日 · Dandruff really isn't about your hair, or how often you wash it. Instead, it's about the skin on your scalp. Skin cells that grow and die off too fast are the cause of dandruff, but doctors...

  2. www.webmd.com › oral-health › dental-root-canalsRoot Canals: Process, Causes, Problems, Surgery, Recovery, ...

    2023年3月20日 · A root canal is a treatment used to repair and save a tooth that is badly decayed or infected. A tooth's nerve and pulp can become irritated, inflamed, and infected due to deep decay; repeated...

  3. www.webmd.com › sleep-disorders › sleep-101Stages of Sleep: REM and Non-REM Sleep Cycles - WebMD

    2022年11月16日 · What Is REM Sleep? Usually, REM sleep happens 90 minutes after you fall asleep. The first period of REM typically lasts 10 minutes. Each of your later REM stages gets longer, and the final one...

  4. www.webmd.com › mental-health › gaf-scale-factsGlobal Assessment of Functioning (GAF) Scale - WebMD

    2023年3月23日 · 1 min read. The Global Assessment of Functioning, or GAF, scale is used to rate how serious a mental illness may be. It measures how much a person's symptoms affect their day-to-day life on a...

  5. www.webmd.com › oral-health › dental-implantsDental Implants: Surgery, Advantages, Risks, & Insurance ...

    2024年2月1日 · What Are Dental Implants? Dental implants are titanium or ceramic posts inserted into your jawbone to hold artificial teeth. They act like the roots of your natural teeth to provide a strong...

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