By carrying out the daily face workout, the manufacturers claim that a person strengthens what they describe as the '12 expression muscles'.

Japan Trend Shop even suggests that the mouth movements can eliminate wrinkles around the eyes.

They say that the device works by providing the facial muscles with extra load, 'forcing everything to work a bit harder and resulting in more youthful, vibrant faces'.

The product is not alone in its oddness, with the Japanese company offering other bizarre contraptions that claim to help reduce sagging jowls and improve face shape.

The Kuwaete Sukkiri Tongue Exerciser is an 'anti-flab muscle mouthpiece' that works in a similar way to the Face Slimmer.

By sticking your tongue in and out of the grapefruit-scented gadget, it works to 'fight sagging cheeks' and 'improve the faceline'.

Another, more sinister looking, face-slimming product on the website is the BB-Sports Bodymaker Face Slimmer Mask.

The product description admits it 'looks a little bit like the costume the baddie wears in a science fiction film (or the cool mask of a supple ninja!)'.

It supposedly works by creating a sauna on your face to tighten the cheeks and chin.

By heating up the skin on the face it 'boosts circulation' and in turn 'produces a sauna effect on the face, tightening your cheeks and chin as you sweat'.

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