Thoughtful and persuasive writers anticipate the reactions of their readers. If you are aware of the objections that might be raised by a dissenting reader, you should attempt to answer those objections in the body of your essay. At times the objections might be so many that you need to devote a special section to responding to them.
In many cases, you may conduct a friendly debate with other positions in the course of your argument. When doing so, it is important that you not distract the reader from the main discussion of your thesis.
Footnotes and non-distracting parenthetical comments can also be used to engage other viewpoints discreetly and concisely.
Other "Crafting Your Paper" topics:
The Body of Your Paper
Two Approaches to Argument
Deciding on Structure
Becoming a Better Writer Home