Without knowing how long the boots were torn, and therefore how much damage may have been done to the joints, it is hard to answer.
If there is any noise coming from the joints, they need to be replaced with what you are calling new axles.
Best way of listening to the joints is to go to an empty car park and have a friend drive your car around in tight circles, forwards and backwards, and on both locks.
With you standing in the middle of the circle or walking beside the inside front wheel, listen for "pops, pings, cracks, and bangs".
Any noise, replace the CV joint complete.
No noise, replace the boots and make sure the joint is clean and has fresh grease in it.
Use the guide mentioned in the above post, or have your mechanic follow that guide.
It is way quicker and easier than the normal method the mechanics tell you they use.

PK