Florida State University Assistant Chemistry and Biochemistry Professor Sourav Saha and his team of graduate students and postdoctoral researchers have made a significant discovery in the study fluoride. Small amounts of fluoride are often added to water supplies to ensure healthy teeth, but too much fluoride can be toxic–even carcinogenic. To ensure fluoride levels are safe, Saha and his team have developed a new chemical sensor that can accurately determine the presence and quantity of fluoride.