Vomiting and reflux can cause these stomach acids to enter your mouth. Stomach acids are very strong and can cause substantial damage to the teeth. For example, people with bulimia, morning sickness or reflux (which can sometimes occur without you knowing) may experience this problem.
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Paternity is a term that refers to biological fatherhood. Pater- means father. If someone were to ask you of your paternity, they would be asking you who your (biological) father is.