Before going to bed at night recite the following words 100-times sitting in front of a full-size mirror in such a way that each and every word should be pronounced clearly and separately. During the recitation the movement of the lips is to be watched intently.
وَحْلُلْ عُقّدَ ۃً مِّنْ لِّسَانِیْ
After reciting this, blow upon both the hands and run the hands over the face 3-times. Go to sleep without talking to anyone. This is to be practiced for 90-days without any break. If for some unavoidable reason a few days are missed these are to be counted and completed at the end of the course.