Choose a topic for your demonstrative speech. Select a simple, uncomplicated topic that will allow you to explain how to do something thoroughly, such as how to take care of your teeth correctly. Write an outline for your demonstrative speech, listing how you plan to introduce your speech, the three steps you want to go over and how you want to end your demonstrative speech.
Give a statement that will grab your audience's attention and set the stage for your demonstrative speech. For example, if you're writing about teeth, explain that each year, adults potentially miss more than 100 million hours of work due to dental problems, according to Delta Dental. Then, explain the thesis -- or the theme -- of your demonstrative speech, which should include the three steps you plan to explain in your speech. Describe why this speech is important to your listeners.
Explain the first step on how to perform your speech topic activity. For example, explain that your listener should brush his teeth for two minutes twice a day using a fluoride toothpaste. Describe how the listener is supposed to not only brush the crowns of the teeth but also sweep the brush bristles along the gum line to keep food deposits from harming the gum.
Give your second step on how to do your speech activity, which might include how to properly hold a piece of floss using the middle fingers and index fingers. Explain how to slide the floss down into the gum pocket between each tooth and wrap the floss around each tooth while moving the floss up and down.
State the third step of your demonstrative speech. For instance, mention that the listener should use an antimicrobial mouth rinse to bring bacterial activity in the sticky film on his teeth to a halt. Explain that your audience twice a day should gargle with the mouth rinse for about 30 seconds and then spit it out. Include statistics, visuals or scientific evidence that will help make your three steps credible to your audience.
Summarize your demonstrative speech's main three points. Make a final statement that is related to one of your speech's original sentences and will help your audience remember your speech. For example, explain that every dollar spent on good oral care can save not only time in the dental chair but also $50 on restorative procedures, according to Best Life and Health Insurance Company.