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Not everyone is blessed with perfectly white teeth. Discolouration can be caused by heredity conditions affecting the strength and colour of tooth enamel. There are external factors that cause staining, too.

Key takeaways:
- Dark-coloured food and drinks like wine, coffee and berries stain teeth over time.
- Tobacco use causes brown or yellow teeth stains.
- Use of tetracycline antibiotics as a child, or during the mother's pregnancy can result in discoloured tooth enamel.

Whatever the cause for stained or discolured teeth, a dentist can help brighten them. Most causes of discolouration aren’t genetic.

More here:

https://yourdentalhealthresource.com/is-tooth-discoloration-hereditary/