You may use an exemption certificate if, as a purchaser: 1  you intend to resell the property or service; 2  you intend to use the property or service for a purpose that is exempt from sales tax; or. 3  you make purchases as an agent or employee of tax-exempt nonprofit organizations or government entities.
Brush your teeth at least a couple of times a day, once in the morning and most especially before bed. And it is just as important to clean between teeth by using dental floss or an oral irrigator. If you have questions, ask your dentist or hygienist about when would be the best time for you to brush.
At night, your mouth is much less active, which allows bacteria more time to grow without being mechanicalyl sloughed off. Many years ago my orthodontist told me that it was most important to brush your teeth before going to sleep (I guess either for the night, or for a nap). Saliva production is down, and if you happen to sleep with your mouth gaping open, your teeth dry out and don't have that protective layer of saliva.