The Doctors discuss a disturbing new TikTok trend -- people using nail files on their teeth!?

Watch: Why Are Teens Participating in Dangerous Social Challenges?

The trend -- which should never be attempted -- involves using the file to trim, shorten, and even out teeth. There are many videos on the platform showing people -- with zero dental care training -- attempting to alter their teeth cosmetically.

Watch: The Social Media Challenges That Are Possibly Endangering Your Child’s Life

Dr. Ian Smith warns this can cause permanent damage. He explains doing this could easily remove tooth enamel and make your teeth more sensitive, while also possibly leading to other dental issues.

The Doctors stress -- please don’t try this at home and always go to your dentist for any dental care needs.

And in more concerning trends seen in social media, find out how teens are taking a common allergy medication in large doses to get high and how it can have possibly deadly consequences.