Original sentence: On the other hand, some people wish to avoid exposure to fluoride, particularly systemic ingestion of fluoride in drinking water, and may choose such bottled water for this feature.People who drink mostly bottled water may wish to use supplemental fluoride, such as that is available by prescription from dentists or doctors
Edited sentence: People who drink mostly bottled water need to be aware of this.They may need to use supplemental fluoride that is available by prescription from dentists or doctors