Will it be hard to show facial expression after endoscopic forehead lift?

Hello, thank you for sharing your concerns. Many patients have asked me this question during their consultation. When done properly, a brow lift, or forehead lift, should raise droopy eyebrows and enhance the youthful appearance of the eyes. A proper technique will not destroy expression lines or make you appear fake. The endoscopic approach is highly recommended for its technique and rapid healing time, along with the ability to address all of your unique concerns. I recommend visiting a board-certified facial plastic surgeon that has experience performing brow lifts.

In the era of Botox, Dysport and Xeomin- neurotoxins that temporarily weaken your muscles of facial animation- many people don't want to have motion of their face, as it contributes to animation lines and an aged appearance. None of the above products raise the brow appreciably, despite manufacturer claims.
Endoscopic brow lift procedures in my hands do not have the goal of destroying, cutting or de-animating the face. There are surgeons who remove or cut the muscles out and their results show an un-natural appearance months after they have such surgery. I don't recommend such techniques.
I recommend endoscopic brow procedures and take the time to show a host of before and after photographs of people of all ethnicities and ages, so your expectations are met.  
The muscle elevation and scalp and skin repositioning performed after brow lifting through an endoscopic technique is minimally invasive and takes about an hour. Through three 1 inch incisions, a 5 mm endoscope directs small instruments to facilitate the goal of making you look younger. The brow position is elevated into a natural look. The crows feet around the eyes are softer and the forehead is very refreshed looking. You can shampoo the day after the procedure. I don't leave any permanent material in the scalp, or under the scalp. The fixation is removed from your scalp in 10 days, and you are healed a few days later. The results last for decades!

Long-term the endoscopic forehead lift should not change your facial expression.  The procedure does raise your brows to a more elevated position, so yes that will change. However, the muscle motion should be the same as before once the swelling is resolved if the muscles are not cut during the procedure.