Des Moines Water Works officials continue to invite comment on fluoridation of the water supply through Saturday.

Fluoride is added to the water supply in an effort to prevent tooth decay and improve general oral health. The tasteless, odorless element is added at a level of .7 parts per million after the water passes through its sanitizing treatment facility.

The American Dental Association, the U.S. Public Health Service, the American Medical Association and the U.S. Department of Health and Human Services all support fluoridation as a preventative measure in tooth decay, particularly in youth.

Opponents argue the addition of fluoride is unnecessary because of over-the-counter products that contain fluoride, such as toothpaste. Others argue the use of fluoride is the equivalent of state-forced medicating of the public or that fluoride is harmful.

Send an email to fluoride@dmww.com or visit www.dmww.com/water-quality/fluoride-comments/ to comment on the issue. Written comments may also be mailed to the Des Moines Water Works offices at 2201 George Flagg Parkway, Des Moines, IA 50320.

Water works officials will present a report on public comments and staff findings to the water works trustees planning committee on Dec. 3 and the full water works board on Dec. 17.