For a safer “radiant smile” approach:
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Brush twice daily for 2 minutes with a fluoride toothpaste.
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Floss daily to remove plaque between teeth.
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For whitening, use an ADA-accepted whitening toothpaste or peroxide-based whitening product according to its directions.
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Avoid brushing immediately after acidic foods or drinks; rinse with water and wait about 30–60 minutes before brushing.
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If you have persistent discoloration, a dentist can determine whether professional whitening or treatment of an underlying issue is appropriate.
If you were asking for a lemon-and-baking-soda recipe for skin, cleaning, or another purpose, tell me which one and I can give you the detailed recipe.