Those people with diabetes who eat a lot of sugar would be at higher risk of developing tooth decay because of the higher levels of sugar in their blood and saliva.
It is best for everyone to consume less sugary foods and drinks and brush your teeth often
Diabetes is a disease where insulin, a key enzyme in the metabolism of glucose, is not secreted correctly by the pancreas for different reasons. The lack of insulin means that the levels of glucose in the blood can fluctuate a lot more than usual. If the levels of glucose in the blood are very high, some of the glucose get passed into the saliva. Bacteria loves glucose, so more glucose in the saliva also means more bacterial growth in the mouth. If people don’t take good care of their oral hygiene (brush teeth regularly to sweep off bacteria), more bacteria can lead to more tooth decay.