• There are several different types of hair dryer technology.dryers image by timur1970 from Fotolia.com
  
  Changing almost as quickly as hairstyles, hair dryers now feature four types of technology: ceramic, ionic, tourmaline and conventional. Newer models also have gadgets such as buttons to release a shot of cold air, retractable cords and removable filters. Other hair dryer innovations are constant or adjustable heat settings, attachments for reducing frizz and folding handles. When choosing a hair dryer, first decide on the technology and then consider special features.
  
  

Ceramic Hair Dryers

• According to Polly Leider of the CBS Early Show, ceramic technology has expanded from styling tools such as brushes to hair dryers. Stylists favor ceramics because they dry hair more quickly than typical brushes, meaning less damage to the hair. These models contain self-regulating heaters and motors constructed of ceramic coils that emit infrared heat. Some ceramic dryers incorporate nanosilver technology. According to Patentstorm.com, nanosilver technology reduces bacteria and fungus formation.
  
  

Ionic Hair Dryers

• Ionic models work to neutralize positive charges in the hair by generating negative ions--atoms with extra electrons. This flattens hair cuticles, reducing frizz and static electricity. As the negative ions shrink water droplets, hair dries quickly. These dryers seal moisture into the hair, resulting in smoother hair. They also reduce static electricity and flyaway hair.
  
  

Tourmaline Hair Dryers

• Tourmaline is a precious stone that can generate a lot of negative ions at once. With so many ions and lower temperatures, tourmaline-heater dryers smooth and soften hair without frizz and heat damage. What's more, hair tools with tourmaline technology heat up quickly, which can reduce drying time.
  
  

Conventional Hair Dryers

• Conventional dryers use rope heaters to heat the air flow. Typically less expensive than hair dryers with newer technology, conventional models can cause hot spots that damage hair. The positive charges these dryers emit can cause hair cuticles to open, causing frizz and static electricity.