Elgydium Dental Floss Fluoride is a dental floss impregnated with fluoride to protect against caries. It is extremely thin, very durable and slightly waxed, so as not to cause injuries to sensitive teeth and gums. Use Elgydium dental floss for complete cleansing of the area between the gums and the teeth. USE: Cut 30 cm of yarn. Wrap around the pointer. Using the thumbs, Gently guide the thread between the teeth with a back and forth movement. Keep the yarn tight and drag it from the tooth surface down. Then place the yarn on the other surface of the tooth and repeat the movement.