whitening your teeth every 6 months, Use baking soda toothpaste from arm and hammer and this mouthwash https://www.amazon.com/Crest-Pro-Health-Mouthwash-Whitening-Energizing/dp/B0126XBQK6/ref=sr_1_2?crid=3IK5E2MQ1ROME&keywords=cesr+whitening+mouthwash&qid=1641095205&sprefix=cesr+whitening+mouthwash%2Caps%2C75&sr=8-2