One dental hygienist discovered a particular ingredient in Crest brand toothpastes that could pose a health risk for consumers. According to Trish Walraven, she started noticing small blue specks in her patients' gum lines. After asking other hygienists, she realized that the blue specks were polyethylene.
"We thought it was a cleaning product or something people were chewing," Walraven stated according to WCPO. "Pretty much everyone was saying that they were using some form of Crest toothpaste."