Well, this depends on your desire on how you want to look. Chemical treatments are a way for achieving straight hair yet it causes damage to your hair. So, you need to limit the use of such chemicals. Everything natural has a different charm of its own. Your desire of having straight hair is understandable but always choose natural styling agents and shun the use of chemical methods as much as you can. Even if you are going for chemical procedures, do not try those very frequently.