Put your iPhone into a holder, make sure the front camera can see your face, launch the app and just smile. SmileTherapy doesn't require you to look straight into the camera to detect a smile.
Artificial Intelligence (AI) is used to detect whether you smile or not. When you stop smiling for longer than 5 seconds the app will remind you to continue.
Scientists have documented the physical release that happens when the facial muscles, along with the thin bones of the face, are moved. They found that smiling releases dopamine and serotonin in the brain, sparking a feeling of happiness.