Occupational Exposure Limits. The amount of toluene that a worker breathes over a work day is determined by the concentration in air, and the length of time the worker is in that atmosphere.Enforceable limits in the United States for the concentration in air have been established by Federal OSHA.he amount of toluene that a worker breathes over a work day is determined by the concentration in air, and the length of time the worker is in that atmosphere.
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.
When you brush your teeth: 1  Brush your teeth 2 times a day, in the morning and at night. 2  Use a toothbrush with soft, rounded-end bristles and a head that is small enough to reach all parts of your teeth and mouth. Do not scrub. 2  Vigorous brushing can make the gums pull away from the teeth and can scratch your tooth enamel. 3  Brush all surfaces of the teeth, tongue-side and cheek-side. 4  Pay special attention to the front teeth and all surfaces of the back teeth.