Do fillings for cavities transmit heat or cold and make your teeth sensitive to temperature?

Yes and no.: With root canal, the nerve is destroyed and the tooth becomes insensitive. Regular fillings do transmit changes in temperature faster, but the difference is less than a second, so the teeth won't be noticeably more sensitive.

Depends: Metal fillings transmit temperatures better than non-metal fillings. Also the deeper the cavity is, the more sensitive the tooth can become after treatment.

Yes: Yes, especially metal ones like amalgam. The composite fillings are less temperature transmitting.

Solve Problem : If this is happening after a few days of a new filling, then something needs to be addressed by the dentist.

Sometimes: Teeth are supposed to be somewhat sensitive to temperature changes since they have a nerve that is designed to protect them. A tooth usually becomes more sensitive just from the drilling of the tooth required as part of the filling process. The degree of sensitivity is proportional to the depth & size of the filling. Amalgam fillings transmit temp. Changes more. See dds if it's a problem.