Getting ready to head to the music shop later this week, I was looking over my horns to see if any had picked up any dinks that I might want to have removed. Luckily, none need any work (which is amazing with a high schooler in the house who also plays them). I remember in the 60s, getting a small dink in my Olds Special. I took it to the shop and the repair guy suggested not removing it, because he said doing so would harden the metal and change the playing characteristics. Had it removed anyway. I also heard that is is best not to remove dinks from a few band directors and others who were considered knowledgeable. 40 50 years later, I haven't heard any such comments or concerns about dent removal -including using one of the best repair places in the south. So, was it fact or fiction that tyical dent removal changes the playing characteristics of the horn beyond what they were originally (I realize if a dent is obstructing airflow it might have an impact)?
If this turns out to be a myth, we ought to get us a thread going about current myths related to trumpets. I have some chemistry background and my wife is a master's level RD (dietician). It is amazing at all of the myths that exist today around nutrition and diets. FIgure trumpet playing likely has some too.