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.
Dentist Tip: Brushing three times a day is ideal. If you can brush once after every mealâbreakfast, lunch, and dinnerâyou minimize the growth of bacteria in your mouth. But wait an hour after each meal: brushing too soon can cause damage to the enamel of your teeth.