“How do I keep my teeth bonding white?”

Keeping them clean and with bleaching.

You asked how to keep your teeth bonding white. A short, direct answer is not putting anything in your mouth that might stain them. This would include wine, grapes, tomatoes, coffee, tea, meat, beets, peas, etc., etc. Water would be okay. Apple juice could stain. There are different kinds of bonding. One is not necessarily better than another. With some, it is best to use very mild toothpaste. Abrasive toothpastes can damage them. The answer you are wanting is to use bleach in bleaching trays from time to time as needed to maintain your whiteness. Your dentist can advise which is best for your circumstances. There is history of people using bleaching this way every day for over a year to treat severe staining. They have done this with no apparent damage to the teeth. You must be very interested in keeping healthy teeth. That would include no new cavities. The best information about having NO new cavities can be found in the book GROWING A HEALTHY CHILD, SECRETS FROM A WISE OLD DOC.

Stains can be removed with a light slurry of baking soda. The best way is to see your dentist who has specific polishers for composite bondings

Rinse your mouth after eating and drinking dark liquids. If it gets stained, all you can do is have a dentist repair or replace it.