I Am 3 Weeks Post-op from a Facelift and Now Have a Crooked Smile. Permanent?

Pictures would help, but based on your description, a crooked smile usually means injury, partial or complete facial nerve damage which may or may not return completely and can take up to two years post surgery to recover. The numbness takes a variable time to recover but eventually most people have return to normal sensation. Botox can sometimes help with the asymmetry of your smile. A filler or fat injection may help with the indentation. Your plastic surgeon if well trained would be the best one to figure this out. If you are not confident in his opinion, there is potential benefit in seeking a second opinion.

Based on your description it appears that you have weakness of one of the branches of your facial nerve.  This typically resolves with time, but can take up to 6 months.  Botox (to the normal side) can often help reduce asymmetry

You should see a Board Certified Plastic Surgeon, and have your face evaluated.  You are still fresh from a surgery and inflammation is present so this all may return to normal, but you do need to be evaluated.    See a Board Certified Plastic Surgeon who is in your area and one who does a lot of facelift procedures.