I was told i might have a cracked root i had a root canal done like 6 months ago dose this mean it will have to be pulled?

Possibly: If the root is cracked, the support mechanism for the tooth as a whole is compromised. Root canal or not, if the fracture travels in a manner that makes the tooth unrestorable, it will need to be extracted.

Root Fractures: Root fractures in almost all cases eventually lead to the loss of the tooth and it is better to remove the tooth and replace it rather than waiting for periodontal breakdown and unnecessary loss of bone. Sorry.

May be: You have to ask the question to your dentist. It is hard to tell without getting all the facts and evaluating the tooth visually. You may end up by loosing the tooth but in some cases it can be saved depending on the location and the extent of the crack.

If pain persist: root fracture is common with teeth and you will have pain on biting or continued pain. if your having persistant pain, get an xray. your dentist need to do more tests, if your dentist want to send you to an Endodontist to check it further. would be good idea.

It is possible: Tooth become brittle after root canal treatment. If the tooth is not adequately restored with a filing, cap or crown the remaining tooth structure will be very prone to crack with the result that the entire tooth may have to be extracted.

Maybe: A vertical root fracture of a tooth often decreases the probability of saving a tooth. However, these have to be evaluated on a case by case basis so I would consult with your dentist or endodontist.

Probably: Probably. You will eventually have unacceptable tooth pain that will necessitate extraction