How does sugar cause an instant tooth ache?

Question

for example, u have a cavity and u eat sugar so it hurts INSTANTLY. but why ? what's in sugar to make it hurt instantly? i could understand cold/hot temperatures but not sugar.

Answer 1

sucrose is easily digestable by bacteria

the bacteria eat the sugar and basically poo/pee on your teeth which demineralizes more enamel and tooth structure.

once you have instant pain from sugar, the decay is already in the late stages and very deep.  you may be beyond a filling at this point and need a root canal.