What can be done for yellow teeths by birth?

Bleaching or veneers: Depending on how dark the shade of yellow is, bleaching products such as crest white strips can be helpful. If that isn't sufficient, you can cover the yellow surfaces with porcelain or composite veneers which will effectively mask the discoloration but at considerably higher expense than bleaching alone. Consult with a dentist or dentists to have your situation evaluated.

Whitening: You can try tooth whitening in a dental office environment. If this gives unsatisfactory results no prep porcelain veneers can be made for you.