Would Botox tighten my double chin? (Photos)

Thank you for your question.  I would recommend a combination of Botox and Kybella.  Botox may be used to help contour the face and Kybella targets the subcutaneous fat.  Once the fat cells are destroyed, these cells can no longer store fat and, your desired look can be achieved.  I recommend scheduling a consultation with an experienced physician for optimal results.  All the best.  

Botox is a neuromodulator that works by relaxing muscles that lead to the formation of facial wrinkles, and would not work well in your case. A double chin can be addressed through different treatment options, including Kybella and liposuction. Kybella is an injectable treatment that destroys the submental fat cells under the chin so they can be eliminated by the body. Patients usually need more than one treatment session to achieve their full results. Liposuction is a minimally-invasive procedure that removes fat from under the chin using small tubes known as cannulas. It can be performed using local anesthetic and requires only a few days of downtime. 
Once the fat is eliminated, it is possible the skin will conform over the new contour. If skin laxity continues to be a problem, we can use a non-surgical skin-tightening treatment like Ultherapy or ThermiTight to put the finishing touches on your new facial profile. Make sure you work with a board-certified dermatologist with extensive experience in facial contouring to ensure an optimal outcome from your treatment.

The double chin problem is best treated with liposuction and skin tightening (Facetite, J-plasma, Thermi, Profound). In some cases where there is excessive skin, a platysmaplasty and neck lift may be required.