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What is the process for repairing small dents in a tuba. Is this possible and what are some cost estimates (whether from knowledge or experience, I know it varies on a case-by-case basis)?

The grand answer, which is not sarcasm, but the way it really is:
"It depends."

How about posting a couple of pictures of the dents for us to gawk at?

iiipopes wrote:"It depends."

What he said. Post a picture. And it depends on how professional you want it to look. A shade tree mechanic can get it about 85% good (give or take) if it is a dent in the shade tree mechanic class.