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Published 14:30 19 Sept 2025 BST
Updated 14:41 19 Sept 2025 BST
Add us as a preferred source on Google »One doctor's self-imposed transformation into a "lab rat" has revealed what happens when you Botox just one side of your face.
"For the sake of science and education and all of you, and myself, I made myself my own lab rat," she told the camera, before explaining how she'd drawn a black line down the middle of her face and administered the neurotoxic protein to the lower half of her right-sided facial muscles.
This included the DAO (depressor anguli oris), which pulls down the mouth's corners, and the platysma, which controls expressions and movement of the mouth.
"Now for you, two weeks later I present my results as I try and contract my lower face muscles," continued Farrell.
As she did so, her untreated left side demonstrated way more muscular flexibility, while her Botox side displayed almost no movement whatsoever.
"You can see that the platysma muscle on this side is really contracting and pulling my jawline down, and so is my DAO, pulling the corner of my mouth down," Farrell pointed out.
Highlighting the right side, she claimed: "I'm really trying to pull this side!"
The doctor also mentioned how the cheek "rides a bit higher", the "nasal labial fold seems softer" and "so does my shadow at the marionette [line]" on her Botoxed side.
An anaesthesiologist by trade, Dr. Bita Farrell runs an educational TikTok channel boasting more than 171,000 followers, and one of her latest uploads documented this fascinating experiment.
"Muscles of the face either pull up or pull down. When the muscles that pull the lower face down (platysma and DAO) are injected and relaxed with a neuromodulator such as Botox, the muscle that pulls the mid face up (zygomaticus or cheek muscle) dominates and pulls the face up! This can help reduce the appearance of marionette lines, jowls, frown, and the nasolabial folds. It also lifts the neck and can sharpen the jawline and make the cheeks appear a bit fuller and more lifted," read Farrell's helpful caption.
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