Daily wear and tear from eating and drinking and diets high in acidic food and beverages can cause plaque to demineralise the enamel layer of your teeth. When the enamel layer is weakened, your teeth become sensitive to external stimuli. Fluoride helps to re-deposit these minerals (calcium, phosphate and fluoride) into the enamel. The remineralised enamel can now protect your teeth, reducing teeth sensitivity.