Corporations must file tax returns in all U.S. jurisdictions imposing an income tax. Such returns are a self-assessment of tax. Corporate income tax is payable in advance installments, or estimated payments, at the federal level and for many states.
An ashen skin color is a result of inadequate oxygen circulation or perfusion.
So if you happen to notice that your gums have turned black, grey, or white, you may be quite concerned. While some gum discoloration is a natural occurrence, other discoloration can be hazardous to your health and require serious attention. Here are the main causes of and reasons for gum discoloration.