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Fortunately, these stains are not at permanent and can be removed with professional teeth whitening

As well as the presented calculations included only patients with CH without any co-existing headache or severe systemic disease, therefore it may be the cause of non-significant association between CH and smoking

Other expenses probably cut out another 15% of this money, which we figured into our calculations lower down in this article

Taxes on meals and room rentals and on motor fuel purchases were of nearly identical importance in funding state services in FY 1990, as each produced in the neighborhood of $135 million or about 16 percent of total tax revenue

doi:10.1186/s12889-015-1617-5

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