Widening of the nose when you smile is normal and does not require special treatment and will not affect your health. If you think it is not beautiful enough, you can choose plastic surgery to improve it. The widening of the nose when you smile is caused by the pulling of the facial muscles, which is mainly related to genetic inheritance and will not affect your health. If it affects the aesthetics of your facial features, you can choose nose reduction surgery, which removes the skin on the lower side of the nose and then makes incisions and sutures to narrow the nose, thus improving the aesthetics. If the nose is too big, you can also choose to do a nose reduction surgery, remove the excessive connective tissue and fat in the nose and then suture. Smile wide nose generally do not have to deal with, if you feel that affects the aesthetic, you can go to the regular hospital plastic surgery department, according to the individual situation, choose the right way of plastic surgery. After surgery, pay attention to personal hygiene, keep local clean, avoid infection.