The given line chart indicates the levels of acidity in the mouth, after eating sweet foods, which can cause tooth decay. In detail, it can be seen that there are 3 types of sweet foods as fruit sugar, cane sugar and honey.
The acidity levels measured by pH values, where two of the are negatively correlated between each other, meaning low value of pH cause high level of acidity. Starting from pH level 5.5 and low, the tooth decay is can be occurred, while with high pH level the tooth decay is less possible.
Moreover, the acidity level in mouth fluctuates over time. The report gives changes of pH level in mouth starting from the moment food has been eaten till 40 minutes after. At the starting point for three types of food there is same value of pH level as 7, which will be gradually decreasing lower the threshold(5.5) where tooth decay might be occurred until the 5 minutes from eating, and then all 3 will be starting slightly increasing until the 40 minutes where the levels again will come to 7.
Overall, comparing each type of food it is significant to note that honey is the least harmful to our mouth, while the second one is fruit sugar and the most harmful is cane sugar.