I got 2 root canals and fillings, but there is still pain in my tooth when i eat hot food and drink cold drinks. why is that?

Nerve transmission: If you had rct completed, then all the nerve tissues were removed and the canals filled. Those teeth cannot produce sensitivity to cold or hot. New fillings, teeth with cavities, or even healthy teeth can produced sensitivity to cold and hot. See you dentist to determine which teeth are causing the sensitivity and whether it's normal or treatment is needed.

Another tooth: See an endodontist! they are experts in diagnosing these problems and treating the offending tooth!

Another Tooth: Root canals remove the ability of that tooth to feel temperature changes. Only a vital ( non root canal tooth) can still feel hot and cold so most likely you ned a root canal on another tooth as well...Sorry. I suggest you go to an endodontist.

New filling?: A tooth that has had a filling placed recently can be sensitive to thermal changes...Especially if the filling was amalgam (silver). A tooth that has had a root canal..If done properly..Will never again feel pain from temperature change. If there is sensitivity to hot or cold, it is likely from another tooth.

Get checked: Your bite may be off, or it's yet another tooth.