Hello, You are suffering a common side effect of flexeril with dry mouth. Considered rare, but known as a side effect, is numbness and tingling in the mouth. Flexeril length of use could affect the length of your side effects. Since this drug affects the neurotransmission, there is a good chance that once no longer in your system, you will return to normal transmission. If you are going from numbness to tingling that is a sign of return of sensation. Allow time to pass. Reduce any inflammation by avoiding irritants and take some anti-inflammatory medications. Proper nutrition and balanced vitamins are recommended. Avoid any deficiencies and keep well hydrated. I recommend that you discuss your symptoms further with your doctor. This drug has been reported to have a number of side effects. You may contact the drug manufacturer to find the most up to date data reported on this drug. Long term use and abrupt termination is not recommended. Review your complete medical history with your doctor to evaluate for any interactions. This may help you to understand your current symptoms and methods to restore normal sensation. Thank you for your inquiry. I hope your symptoms will resolve and you feel better soon.