Stress is destructive to health and relationships. Stress is experienced when a person feels demands and expectations that exceed perceived available resources. Resources may relate to time, money, skill, tools, etc. The perception of the imbalance between the demands and resources and potential future adverse consequences for failing to meet the demand or expectation does not have to be correct in order for the situation to cause stress.

Unlike whitening toothpastes,which only remove surface stains to reveal the underlying whiteness of teeth, bleaching agents actually make teeth whiter. The most common teeth bleaching agents are...