Dry mouth (xerostomia) is a known side effect of Botox (botulinum toxin) injections, including those used for cervical dystonia. This occurs because Botox can affect the salivary glands, reducing saliva production. The good news is that the dry mouth typically resolves as the effects of the Botox wear off. Botox injections are not permanent, and their effects generally last about three to four months. Once the Botox wears off, the function of the affected glands usually returns to normal, and the dry mouth should subside. However, if the dry mouth persists beyond the period when the Botox is expected to wear off, it is advisable to consult with your healthcare provider. Persistent symptoms could indicate another underlying issue that may need to be addressed. Dry mouth due to Botox for cervical dystonia should go away as the effects of the Botox wear off, typically within three to four months. If it doesn't, follow up with your physician for further evaluation.