I have had increasing sensitivity with my top left big front tooth for a few years. it has also been becoming increasingly discoloured and yellow. I have seen 2 different dentists, the first one took an X-ray and told me that there was a hairline crack, and that my tooth was dying. the was very little nerve left. my main intention was to whiten my teeth (as my teeth are quite yellow, with the affected tooth even more so). he told me just to leave my teeth alone, and wait for the tooth to die, as my pain was not debilitating. i waited for nearly another year before i decided i could not live with my discoloured teeth anymore. i went to another dentist, and asked for a root canal, crowning and whitening. and she also told me the same thing: just leave the tooth alone until the pain is really really bad. in the meantime i can bleach my teeth, but she advised against the root canal, as i was only experiencing sensitivity, not pain.
1) as my tooth is already dying, shouldnt i do a root canal and save it before it gets infected/has to be extracted? why are both dentists advising me against the root canal? regardless whether or not there's only sensitivity, and no pain.
2) the second dentist explained that the crowning on the tooth would not match my other tooth, so said that i would have to crown the other one as well. i was receptive and open to that idea, yet she also advised against the root canal.
basically, i am just confused. from what i have read online, what i need is a root canal. i do not understand why both dentists are telling me not to do so. i do not want to wait until the pain is excruciating before i see the dentist. and i do not want to have my tooth extracted when it is too late. what should i do?