Device for reducing noise pollution linked to snoring and comprising: • a screen arranged to be disposed between the lips and the teeth of a user and having: ∘ a first surface arranged to be in contact with the lips of the user, and ∘ a second surface arranged to be in contact with the teeth of the user, ∘ a duct crossing the first surface and the second surface and forming a protrusion over the first surface of the screen , the duct being arranged to be disposed between the lips of the user, the duct having a cavity delimited by an inner surface of the duct , the cavity leading to: ▪ a first opening arranged to be opened towards the outside of the mouth of the user, and ▪ a second opening arranged to be opened towards the inside of the mouth of the user, characterised in that the device further comprises an obstruction element coupled with the inner surface of the duct and in that the device is arranged such that the obstruction element : • takes a first position wherein it obstructs at least partially the cavity of the duct , • takes, under the action of a phase of the user breathing out through the mouth, a second position wherein it obstructs less the cavity of the duct than in the first position , to allow for an expiration output of air, and • takes, under the action of a phase of the user breathing in through the mouth, a third position wherein it obstructs less the cavity of the duct than in the first position , so as to allow for an inspiration input of air, the second position and the third position being situated on either side of the first position . • a screen arranged to be disposed between the lips and the teeth of a user and having: ∘ a first surface arranged to be in contact with the lips of the user, and ∘ a second surface arranged to be in contact with the teeth of the user, ∘ a duct crossing the first surface and the second surface and forming a protrusion over the first surface of the screen , the duct being arranged to be disposed between the lips of the user, the duct having a cavity delimited by an inner surface of the duct , the cavity leading to: ▪ a first opening arranged to be opened towards the outside of the mouth of the user, and ▪ a second opening arranged to be opened towards the inside of the mouth of the user, ∘ a first surface arranged to be in contact with the lips of the user, and ∘ a second surface arranged to be in contact with the teeth of the user, ∘ a duct crossing the first surface and the second surface and forming a protrusion over the first surface of the screen , the duct being arranged to be disposed between the lips of the user, the duct having a cavity delimited by an inner surface of the duct , the cavity leading to: ▪ a first opening arranged to be opened towards the outside of the mouth of the user, and ▪ a second opening arranged to be opened towards the inside of the mouth of the user, ▪ a first opening arranged to be opened towards the outside of the mouth of the user, and ▪ a second opening arranged to be opened towards the inside of the mouth of the user, • takes a first position wherein it obstructs at least partially the cavity of the duct , • takes, under the action of a phase of the user breathing out through the mouth, a second position wherein it obstructs less the cavity of the duct than in the first position , to allow for an expiration output of air, and • takes, under the action of a phase of the user breathing in through the mouth, a third position wherein it obstructs less the cavity of the duct than in the first position , so as to allow for an inspiration input of air, the second position and the third position being situated on either side of the first position . <EOS>