Bitterness folds are the vertical lines extending from the corners of the mouth to the jowls. Their name is derived from the downwards motion of the corners of the mouth when expressing disagreement or bitterness.

The Depressor Anguli Oris muscle, in the outside corners of the mouth, contracts the corners of the mouth downwards. When repeated and combined with the natural melting of the fat tissues of the face, these expressions create bitterness folds that are not visible when smiling.

Two treatments aim at correcting bitterness folds:

  • Hyaluronic acid injections can be performed in the fold situated just forward of the bitterness fold where the natural fat melted over time in order to blur those folds by supporting the corners of the mouth. A cross-linked and volumizing hyaluronic acid is used in order to obtain a satisfying correction. Injections should be renewed once a year.

For an effective and long-lasting correction of the bitterness folds, injections should be performed in the Depressor Anguli Oris muscle. The excessive contracture of this muscle create bitterness folds. There is no need to treat the consequences rather than the cause. Botulinum toxin injections can be given within six month period. One injection on each side of the mouth will be sufficient to treat the cause of the bitterness folds. This treatment can be performed along with a botulinum toxin treatment in order to treat the forehead and the frown lines.