Thousands of men desperate for a chiselled jaw are chewing on a rubber ball as part of a bizarre and potentially dangerous trend.
They're sharing videos of themselves gurning awkwardly online as they chomp down on the £40 resistance ball with hopes of achieving more defined facial features.
US company JawlineMe promises customers a pronounced jawline within just three months if they perform a 10-minute 'workout' daily.
Thousands of men desperate for a chiselled jaw are chewing on a rubber ball as part of a wacky new trend. One customer shared his results on the Instagram page
They're sharing videos of themselves gurning awkwardly online as they chomp down on the £40 resistance ball. Another shares a clip of him using the device on social media
On its website, the firm claims chewing their Fitness Ball & Facial Toner product once a day leads to 'slimmer and healthier skin, a reduced double chin and a sharper jawline'.
Customers can buy the product, which is being promoted by Instagram influencers, with varying levels of resistance.
Heavily-tattooed British social media influencer Andrew England, who boasts 350,000 followers, advertised the product to his fans in June.
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Share 805 sharesA photo of Milla Jasmine, an Instagram star with 2.1million followers based in Paris, was used to promote the product to followers in February.
The resistance ball has been promoted by scores of smaller influencers over the past year. Similar products are being sold on Amazon.
JawlineMe advises people start on 'Blue Level 1' and slowly work their way to 'Black Level 3'.
Heavily-tattooed British social media influencer Andrew England, who boasts 350,000 followers, advertised the product to his fans in June
A photo of Milla Jasmine, an Instagram star with 2.1million followers based in Paris, was used to promote the product to followers in February
Sebastian Tristan, a Swedish influencer with 35,000 followers, advertised the product to his fans in January
But dentists have warned the products were useless and could potentially cause unwanted side effects.
Dr Richard Marques, of Devonshire Place Dental, told MailOnline: 'The dangers of this are that the device may actually damage or crack your teeth because of the hardness of the material used.
'This can lead to the need for expensive fillings or crowns, or even the teeth breaking and having to be removed.
'Additionally the device could actually cause TMJ disorder by dislocating your jaw joint. This can result in pain and problems opening and closing your mouth.
'The Love Island effect is definitely a feature in people wanting to improve their jaw shapes.
'This is because people are influenced by what they see on social media / the TV and they want to improve their appearance to look more like the stars of reality shows like this.'
Tom Walker, one of the contestants on the most recent series of Love Island, was praised for his sharp jawline on social media
Experts say the JawlineMe products are a result of the Love Island effect. Pictured: Danny Williams, who was on the show this year
Dr Rhona Eskander told MailOnline the JawlineMe ball simply 'doesn't work'.
She noted that over-stimulation of the masseters - the muscles located toward the back of your cheeks - can lead to 'enlargement and make you look larger in the jaw line'.
But, similar to teeth grinding, it can cause facial pain and headaches, and wear down the teeth over time.
JawlineMe insists its product 'has been been designed to give your jaw muscles a workout using their full range of motions... helping to gradually activate your facial muscles and get the perfect jawline.'
The company provides a set of instructions on its website which read: 'Simply put the product in your mouth and place your teeth on the bite strips.
Company JawlineMe promises customers a pronounced jawline within just three months of using the Fitness Ball & Facial Toner
Customers have been sharing videos as they perform the 10-minute daily 'workouts' which see them chomp down on the ball repeatedly
The firm even lists a workout guide, which bizarrely includes drop-sets and super-sets
JawlineMe insists its product 'has been been designed to give your jaw muscles a workout using their full range of motions... helping to gradually activate your facial muscles and get the perfect jawline'
'Make sure our "JawlineMe" logo is turned the right way and not upside down when you use our product.
'If the bite strips doesn't fit you well you can place the product (with the bite strips) in boiling water for 8-10 seconds.
HOW IS JAWLINEME SAID TO WORK?
JawlineMe promises customers a pronounced jawline within just three months if they perform a 10-minute 'workout' daily.
The firm claims chewing their Fitness Ball & Facial Toner product once a day leads to 'slimmer and healthier skin, a reduced double chin and a sharper jawline'.
Customers can buy the product, which is being promoted by Instagram influencers, with varying levels of resistance.
The company provides a set of instructions on its website which read: 'Simply put the product in your mouth and place your teeth on the bite strips.
'Make sure our "JawlineMe" logo is turned the right way and not upside down when you use our product.
'If the bite strips doesn't fit you well you can place the product (with the bite strips) in boiling water for 8-10 seconds.
'Then softly bite into the bite strips, hold for a few seconds, and the bite strips will mold after your teeth for the most comfortable fit.'
The firm even lists a workout guide, which is structured like a gym workout and bizarrely includes drop-sets and super-sets.
<!- - ad: https://mads.dailymail.co.uk/v8/gb/health/none/article/other/mpu_factbox.html?id=mpu_factbox_1 - ->Advertisement'Then softly bite into the bite strips, hold for a few seconds, and the bite strips will mold after your teeth for the most comfortable fit.'
The firm even lists a workout guide, which is structured like a gym workout and bizarrely includes drop-sets and super-sets. MailOnline has contacted JawlineMe for comment.
This website reported last month that men in TV shows and adverts are making male viewers at home feel bad about their bodies.
Reality shows and commercials have already been blamed for driving insecurities among young women and leading to a rise in cosmetic surgeries.
But researchers now have growing evidence that men are vulnerable to body envy, too.
Watching toned and muscular models on television is making men wish they were taller, stronger, slimmer and have more defined features, they found in a study.
One expert said the effect is relatively recent as men are more health and body conscious than they used to be, and that there needs to be more research into how men specifically are affected.
Researchers at the University of the Sunshine Coast studied 110 men to look at the effects of watching sexualised versions of men on TV.
They found that while music videos and still photos didn't have much of an effect, seeing fit men on television significantly dented satisfaction with their own bodies.
'Our key finding was that viewing idealised depictions of men in television commercials was the only media type to trigger body dissatisfaction, likely due to increased social comparison,' wrote the researchers, led by Dr Kate Mulgrew.
On a scale of one to 10, men's body satisfaction dropped from an average 5.14 to 4.58 after watching about three minutes of advert footage – an 11 per cent drop.
CAMPAIGNERS CALL FOR BOOB JOB AND DIET ADVERTS TO BE PULLED FROM LOVE ISLAND SLOTS
Adverts for cosmetic surgery and diet supplements should not be shown during Love Island, campaigners said last year.
Feminist campaigners Level Up called on ITV to ban cosmetic adverts from the show, and were joined by the British Association of Aesthetic Plastic Surgeons (BAAPS).
They said the decision to advertise boob jobs and weight-loss drinks during the hit ITV reality show is 'irresponsible' and risks affecting vulnerable people.
Research revealed the show makes nearly half of its viewers more self-conscious about their body and appearance.
The tanned and toned 20-somethings on the show spend most of their time in bikinis and swimwear, which is affecting what people think are normal bodies, experts say.
A poll by Level Up found 40 per cent of young women who watch the show said it affected how they thought about their own body.
And 30 per cent of the 2,246 women in the survey admitted to considering going on a diet after watching the show, and 11 per cent had thought about getting lip fillers.
Former president of BAAPS, Nigel Mercer, told MailOnline at the time: 'Love Island and social media put a lot of pressure on people's ideas of what is normal.
'There's a problem when these procedures are advertised as "your life will be like Love Island if you have this done".
'There's no doubt people are enormously influenced by what they see on television.'
ITV said the ads were shown a very small number of times and that the company ensures all advertising sticks to industry rules.
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