Complex sentence: Two studies in 2003 and 2006 found that Invisalign could adjust teeth vertically with 79 to 84 percent accuracy, while a 2009 study in the American Journal of Orthodontics & Dentofacial Orthopedics obtained a mean accuracy of 41.3 percent and a vertical alignment of only 29.6 percent.
Split into simpler sentences: Two studies in 2003 and 2006 found that Invisalign could adjust teeth vertically with 79 to 84 percent accuracy. A 2009 study in the American Journal of Orthodontics & Dentofacial Orthopedics obtained a mean accuracy of 41.3 percent and a vertical alignment of only 29.6 percent.