If I were to bleach calcificated teeth would it make the calcification more visible?

I have found most of the time that calcification spots tend to get whiter with teeth bleaching. That being said, there are other options such as post bleaching bonding or MI paste.

Sometimes the white spots will show up more white. Sometimes they will blend in better once the teeth are whitened. It's something you won't know until you do it.

Bleaching your teeth will not help or eliminate decalcification spots on your teeth and yes you’re correct, it will make them more noticeable because they become whiter. To repair decalcification spots, go to your dentist and ask about a product M.I. Paste Plus. That will restore your enamel and eliminate decalcification spots. Or if your decalcification spots are large, you can always have the removed and have white fillings or porcelain veneers placed on your teeth.