If a cavity doesn't hurt, do I not need to treat it?

Even if it does not hurt, the cavity still needs to be treated. Cavities cause no pain in the early stages - by the time you notice sensitivity or pain, the decay has often already reached deep into the tooth or close to the nerve. 1) Early cavities can be finished with a single resin filling, but 2) once it spreads to the nerve, root canal treatment and a crown become necessary, which significantly increases the number of visits and the cost. Right now, while there is no pain, is the easiest time to treat it - so we recommend not putting it off.