Tags are very common in spoken English, and have many functions. One of the common functions is to start a conversation or help keep it going. The two basic rules about tag questions are:1  If the statement is negative, the tag must be positive.ags are very common in spoken English, and have many functions. One of the common functions is to start a conversation or help keep it going. The two basic rules about tag questions are:
The average cost for a community to fluoridate its water is estimated to range from approximately $0.50 a year per person in large communities to approximately $3.00 a year per person in small communities. For most cities, every $1 invested in water fluoridation saves $38 in dental treatment costs.55 âFor most cities, every $1 invested in water fluoridation saves $38 in dental treatment costs.â It can be calculated from these data that the average lifetime cost per person to fluoridate a water system is less than the cost of one dental filling.
CLEARWATER â Pinellas County will stop adding fluoride to its drinking water, ending a cavity-fighting effort that riled critics of Big Brother government despite decades of advocacy by dental and medical experts.Related News/Archive.luoridation costs the county about $205,000 a year. Pinellas County began adding fluoride to its water in 2004. Before that, it was the largest water supplier in the eastern United States that did not fluoridate its water.