No, under eye Restylane really should not be noticeable when smiling if it was performed by an experienced injector. Typically it only takes rather small quantities of Restylane or Juvéderm to improve the trough or groove under the lower eyelid and if it is performed by an experienced injector, this should be a very natural appearing improvement in the lower eyelid area and should not be noticeable when you smile. An added bonus is that the result typically lasts approximately one year in most patients, which is significantly longer than other areas of the face.