1. When removing the stains, please wipe gently so as not to damage the gums and oral mucosa; 2. Properly wet the cotton swab when it is soaked, making sure it is not too wet; 3. It takes about 1 min to wipe each tooth; 4. If the stains can't be removed completely, please use again after a week; 5. Children under the age of 13 should not use it. Do not try to swallow. Storage:After use, please tighten the cover, store it in a cool and dry place, so as to avoid direct sunlight. Package Included: 1Pcs Teeth Whitening Products Specifications: PUTIMI Teeth Whitening Serum Teeth Stains Plaque Remove Brighten White Tooth Cleaning Serum Oral Hygiene Dental Bleaching Tool Package Included: 3pcs Teeth Whitening