In the following items, each passage consists of six sentences. The first sentence (S1) and the final sentence (S6) are given. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. 

S1: Bacteria in the mouth can cause bad odour and painful tooth decay. 
P: Children's eating habits leave them prone to tooth decay. 
Q: They grow in food particles left between teeth.  
​R: They often eat sweets and other items between meals. 
S: Therefore, regular brushing after every meal eaten at home is essential.
S6: Toothpaste advertisements are truthful when they advise us to brush regularly.