This is dated article, but it gives some decent information, and shows what can be accomplished if people are patient, and the laser is used properly.
Excerpt from article:
Getting a tattoo can be a major milestone for some people, but according to a new advice from the government, many may come to regret the ink and try to get it removed.
According to the American Society for Dermatological Surgery (ASDS), almost 100,000 tattoo removal procedures were performed in 2011 -- a vast increase from the 80,000 that took place in 2010.
It may be because 21 percent of American adults are now tattooed, a Harris Interactive survey conducted in January 2012 reports. The number has increased from 16 and 14 percent since Harris Interactive last polled people in 2003 and 2008 respectively.
However, the myth that tattoo removal is painful isn't always true. FDA's Mehmet Kosoglu, who reviews applications for marketing clearances of laser-devices, said in the FDA's report that it really depends on the patient's pain threshold. Green pointed out that her patients receive numbing creams and lidocaine shots to relieve discomfort.
The full article can be found here: http://www.cbsnews.com/news/fda-tattoo-removal-no-simple-process/