What are some symptoms of dental caries?

Early: Early caries sometimes present with sensitivity/pain to sweet .As the lesions progress thermal changes will often cause pain (more often cold). Bad breath can also be due to dental caries.

Could be no symptoms: Some cavities present with no symptoms. Even if the tooth shows no symptoms, a dark color or a change in the reflection of light could clue you in to the presence of a cavity.

Dr Cohen agreed

Pain, sensitivity...: Cavities in the early stages are painless, but as they get bigger and deeper they get into the part of the hard organic tooth tissue called dentin with nerves. While each individual is different, temperature, sugar, salt, sweets, pressure could all set off a pain response. If the decays get into the soft tissue of the tooth, the pain can become extreme and worse if infection sets in! Get it fixed