No, not even 2 scans
Patients get CT scans all over the world, every day.
As long as there is a good reason for the scan, it is fine to do. If repeated scans are planned, to follow some sort of serious illness, a patient can ask his doctor what other options there are, in order to decrease the total number of scans in his lifetime. Having repeated CT scans, over and over, can add up to much x-ray exposure.