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It's my 7 month old grandson he has gray lines on his bottom 2 teeth and lines on his top tooth, my daughter in law breast fed the baby, to the best of my knowledge the baby recently had another series of baby shots. Also the babies pedititrition said the gray lines are due to the lack of cholrine or to much cholrine in the town drinking water...I dont buy it.agree with that. The baby also had thrush he was brest fed for the first 6 months...My daughter in law is also a vegitarian, and she stoped drinking milk.