Will getting salivary gland Botox help smooth out the double chin line?

I learned about salivary gland Botox because I heard that enlarged salivary glands under the ears or chin can make the face look thick. I am concerned because regular jaw Botox alone doesn't seem to fully refine the lines around the ears and jawline. For those of you who have received salivary gland Botox, was it actually effective for reducing a double chin or defining the jawline? I am curious if you experienced any side effects after the procedure, such as dry mouth or a sore sensation due to reduced saliva production. Sharing your experiences regarding the timing of the effects and your level of satisfaction would be a great help in making my decision!