And I mean yellow. Mainly his bottom teeth. We brush twice a day and mouthwash but not all the time. He is 8 and I now us an adult tooth paste to see if this helps. He had a dental appointment 2 myths ago and dentist said they were fine and normal. I'm not too keen on my dentist tbh he doesn't really instill trust. They look worse then my dads teeth today maybe because he's eaten etc i don't know