From Spirit Magazine (Oct.2003). Lene Marlin Interview:

"Attention came in large amounts when Lene finally opened her mouth again on July 31st. And since most people long since had understood she had been struggling psychically, the mouth was just the more sensational on this day: The charming coin slit she had between her front teeth wasn't there anymore.

- I was originally to have braces long time ago, but I was thinking I could use it as an explanation on why I was gone for so long, Lene chuckles."

Check out these pics to see the big difference

https://dereferer.me/?https://dereferer.me/?http://www.tototheband.com/lmpics/displayimage.php?album=16&pos=7

https://dereferer.me/?https://dereferer.me/?http://www.tototheband.com/lmpics/displayimage.php?album=20&pos=44


Both pics are available in full-size as well.
Pics of her in braces are welcome, but i think there's none on the Net as she was off the spotlight for more than 4 years during treatment.