Facetune can only handle demo photos, which is caused by the wrong settings. The solution is as follows:

1. First, open facetune in your computer and select a picture you want to retouch.

2. Click "Whitening" in the toolbar. This function is mainly used to whiten teeth. After choosing, brush your teeth two or three times left and right, and then save them.

3. The function of "smoothing" is mainly aimed at the skin, which is equivalent to the polishing of general retouching software.

4. "Re-shaping" is actually what we call face-lifting and slimming. Another advantage is that the bricks will not become warped.

5. Finally, the function of "complement" has two circles. The first one is placed where you want, and the circle pointed by the arrow is placed where you want to remove it.