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.
Dentists recommend you do it twice a day: after breakfast and just before bedtime â unless you've just had something acidic. It's best to avoid eating or drinking after you brush at night, as the toothpaste will cover your teeth with a thin layer of fluoride, which will help strengthen your teeth while you sleep. And remember to floss daily to remove food and plaque bacteria from in between your teeth, where your toothbrush can't reach.