I recently developed a severe tooth ache and luckily was able to get my dentist to see me on a Sunday to see what was wrong and to remove the discomfort.
She diagnosed it as a root canal problem and put me on medication to prepare me for the treatment and to manage the pain.
The next appointment was for Wednesday and during that visit I was told that there would have to be three more visits before the treatment would be over. I seriously considered getting rid of the tooth but she advised me to save it by the treatment. I agreed and am now under the regimen of medication and waiting for the next visit due on Monday.
Being the impatient fellow that I am, I simply cannot understand why such a long duration treatment is necessary but am assured by my GP and some friends who have undergone root canal treatment that this is SOP.