Speak slowly and clearly. Do not yell, exaggerate, or over enunciate. It is estimated that only three out of 10 spoken words are visible on the lips. Overemphasis of words distorts lip movements and makes speechreading more difficult. Try to enunciate each word without force or tension.
Short sentences are easier to understand than long ones.
Look directly at the student when speaking. Even a slight turn of your head can obscure the speechreading view. Do not place anything in your mouth when speaking. Mustaches that obscure the lips and putting your hands in front of your face can make lipreading difficult. Maintain eye contact.