Yes. Have you tried this 'Tongue neutral position'. I have been trying this for the past few days and it is working like a treat! The thing is, that basically the tongue plays a major role in the face. Putting it in a neutral position when not speaking puts the face in a more relaxed position (Although at the start it will put a strain in the tongue muscles). I guess that it strenghtens the tongue too (My speech therapist gave me similar exercises for the tongue so I guess theres some truth to that). Good luck! Also, just remember that stuttering is due to physcholigical fear in your subconscious mind. It IS curable! Have faith.