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.
My friends and I have had this conversation many times. We all brush our teeth twice a day (morning and night), but there usually comes a time when you miss one or the other. So, which one is most beneficial to the health of your teeth? I argue that it's better to brush at night, so you get all the junk off your teeth before you go to sleep. You might have bad breath in the morning, but that's better than giving sugar and plaque eight extra hours to work away on your enamel while you're sleeping.