What are the chances that the smile stays the same after Botox in the chin?

Thank you for your question. Botox treatment in the skin should relax the muscles in the area and smoothen out the skin. It would not normally affect your smile.All the best with your treatment.

Thank you for your question Bkbaby. I understand your concern. Botox is a purified protein used to address wrinkles associated with facial expression. When injected into the skin Botox will relax the muscles and smoothen out the overlying wrinkles. The most common areas of treatment are in the upper face. These include the horizontal lines seen on the upper forehead when one raises the brows, the vertical lines seen between the brows when one frowns (frown lines), and the crow's feet seen around the eyes when one smiles.
It is difficult to make an assessment without a formal exam in the office where I can view the skin in multiple angles and observe wrinkles formed with facial expression. However, I hope the information provided here is useful.Although Botox is most commonly used in the upper face, it can also be used in various areas in the lower face. Botox can be placed in the mentalis muscle on the chin to address a cobblestone appearance or dimpling on the chin. In this area 2-8 units of Botox are used.When Botox is used appropriately in this area, there should not be a change in the appearance of the smile. However, there may be side effects which area very rare as described below.In the lower face, the depressor labii inferioris (DLI) muscle sits between the mentalis and the depressor anguli oris (DAO) muscles. The DLI muscle is responsible for pulling down the lower lip and it is used when one smiles. If Botox spreads from either the DAO or mentalis to the DLI and relaxes the DLI it can lead to the appearance of an asymmetric smile. Some physicians try to correct it by placing Botox into the contralateral DLI muscle (on the other side). However, I recommend that my patients just wait as the effects go away on their own. This side effect resolves on its own in 2 weeks to 4 months, depending on the severity.
With any injection, there are risks such as pain, bleeding, bruising, redness, swelling, tenderness, and infection. We take special precautions to minimize these risks such as using a painless technique. We also treat bruises with a laser as early as the next day. Bruises usually resolve within two weeks if untreated. After a laser treatment bruises usually resolve in 1-3 days, but may still take two weeks for full resolution. In addition to these risks, with Botox there is also a risk that the product spreads or diffuses to nearby structures. Spread to nearby muscles can lead to side effects such as the temporary appearance of droopy eyelids or a temporary asymmetric smile.

After a Botox treatment, I recommend that my patients avoid heat exposure, alcohol consumption, and strenuous exercise for 24 hours and not lie down flat for four hours. This is because all of these activities may possibly lead to the movement of the product and consequent side effects such as droopy eyelids. Although there have been no definitive studies shown that these actually occur and some physicians do not provide such aftercare instructions, in the absence of data I err on the side of caution and recommend that my patients avoid such activities.

Please consult with a doctor for specific recommendations. Good luck!