A word that describes medication, vitamins pesticides and household cleaners is obviously CHEMICALS. Chemicals are developed to bring utility and somehow comfort to what we do and what we need to do. Drugs and fresheners are chemicals. This is the best answer i could give you hope this helps.
<h3><u>Surprising fact in Nutrition:</u></h3>
Nutrition is the science that studies with the food habit of the person and deals with the nutritional effect of each and every quantities of food components. There it's suggested that for a person, fat should consist of 10 to 35% of the total calorie content of food.
Fat has two components - saturated fat and unsaturated fat. Consuming saturated fat is very bad for health as it increases the chances of cardiac diseases and increases the adipose tissue content of body. But consuming the unsaturated fat is good which has just the opposite effects of saturated fat. It is cardioprotective in nature. My eating habits drifted from saturated fat to unsaturated fat due the fact learned from Nutrition.
The brown stuff is called plaque. This forms on your teeth when you eat and its something you can't get rid of. There is tooth paste that can help maintain it.