Most often people neglect one thing in their life is Getting a proper treatment for their diseased tooth.
As the above 👆picture clearly shows a tooth will be weak and sad if the cavity persists for a long duration.
Unfortunately people neglect this situation very naively due to no pain to the tooth.
Which is very dangerous.
A tooth will have sensitivity and tenderness when the pain exceeds the pain threshold.
Till then it remain asymptomatic(painless) till it reach a situation where the pain impulse again gets activated.
Pure neglection by the patient can cause them a tooth removal which could have saved or to extreme extent even life due to severe negligence and the spread of infection.
Above given is only few points which causes pain and in a normal case it doesn't have to be symptomatic(painful)
But know that pain is not the main criteria or the only criteria to get a dental treatment done.
DrRustham