With over 30% whitening agent, Smilepen mouthwash is the strongest tooth whitening serum for whiter teeth. This protects your tooth structure and whitens your teeth at the same time as your daily oral care. Where toothbrushes and whitening products are difficult to reach, Smilepen mouthwash is the perfect addition for all-round white teeth. Additional hyaluronic acid nourishes and revitalizes the gums and builds up the oral flora.