The given line graph represents the variation of specific pH level and time taken per minute for sweet foods to reach the decay threshold in human mouth.
At a glance, it obvious that the initial pH level of all type of sweet food, which are fruit, cane, and honey, is 7 pH. Decay can occur when the pH level score reaches 5.5 pH. It is obvious that all foods had entered this level after nearly 3 minutes of eating.
After the first 3 minutes, the level of pH decreased for all sugar types and to a level below 5 pH, at which they enter the range in which decay can occur. By this time, cane sweet seemed to have the lowest level at around 3.7 pH. In the second interval, honey had experienced a stabilized trend, whereas cane and fruit exhibited increases in pH, at just above 4 pH and 5 pH respectively.
All types of food can enter the level of being unlikely to cause decay when they reach again the level of 5.5 pH and above. Cane had the shorter amount of time needed to be safe from decaying again after 13 minutes of eating, followed by fruit food at 20 minutes. Ultimately, honey took the longest time to be unlikely to decay again at about 30 minutes with a level of 7 pH. Finally, by 40 minutes, all food types firmly pointed at a level of 7 pH of acidity.