PORTLAND -- Mayor Sam Adams announced on twitter Friday afternoon that he would support fluoride in Portland's drinking water.
It's been 32 years since Portland voters decided to keep fluoride out of their water. In just a few weeks city council will most likely change all that.
Portland is the largest city in the U.S. without fluoride in its drinking water.
A coalition of 70 local organizations and groups is lobbying commissioners on the issue. Friday morning the Everyone Deserves Healthy Teeth coalition had a planning meeting.
"Every national health organization overwhelmingly supports water fluoridation," said Kylie Menagh-Johnson with the healthy teeth coalition.
While supporters say fluoride is one of the greatest public health achievements of the past century, opponents point to studies linking fluoride to possible brain problems.
"There is complete evidence that shows fluoride is a developmental neurotoxin, which means not only does it reduce children's IQ's, it also can cause autism and learning disabilities," said Roger Burt a longtime opponent of fluoridating water.
Both sides are prepared for a heated debate. Portland City Council is expected to vote on the issue September 12.