Numbing the area will depend on the treating practitioner. Personally, I do not numb the area. If the practitioner is using a cannula, they “may” put a bleb of local anesthetic, but I do not, as it is one small incision with a needle.
From feedback from my own patients, I don’t believe it’s painful to have tear trough filler. It just feels a little odd because it’s so close to the eye. Sensation may also be different depi get whether the practitioner uses a needle or cannula. A cannula is a long, blunt tipped needle, and the entry point is often more toward the mid pupillary line in the cheek. Because of the blunt tip, it can kind of feel like a popping sensation. A needle may also be used, but no popping or tugging sensation, as the needle is sharp and goes through all the layers of the skin, muscle and fat pad.