The specific steps to use PS to repair a double chin are as follows:

1. First, we select a photo with a double chin, copy a layer, ctrl+J, or right-click to copy directly. Use a pen to select the double chin, try to select it as carefully as possible, and use the pen to select the outline bit by bit.

2. Select the path and drag the path just selected by the box to the dotted circle under the path panel, and a selection will appear. Or the shortcut key ctrl+Enter can also directly convert the path into a selection.

3. Return to the layer panel, adjust the selection, right-click the selection, and feather it to about 5 pixels.

4. Copy the selected selection to two layers using ctrl+J, and create a clipping mask for the top layer. Just right-click and select.

5. Adjust the deformation of the top layer, ctrl+T, right-click and select deformation, slowly pull it upward, and you will find that the double chin has become smaller. If you feel the effect is not obvious, repeat the above steps a few more times.

6. The final result picture is as follows, we have perfectly removed the double chin.