How Do You Remove Dents From Brass Instruments?
Dents are one of the most common problems we see with brass instruments — from trumpets and trombones to horns and euphoniums. Even a small dent can affect airflow, tuning, and the way the instrument feels to play. But how do you remove them safely?
Why Brass Instruments Dent So Easily
Brass is a relatively soft metal, which makes it easy to shape during manufacturing — but also easy to dent. A light bump on a stand or doorframe can leave a mark. While some dents are purely cosmetic, others can restrict airflow or slightly distort the bore, which affects tone and response.
What Not to Do at Home
It’s tempting to try and push a dent out yourself — but that’s the quickest way to cause more harm. Using tools like screwdrivers, rods, or heat can stretch or crack the metal. Some online “DIY tricks” like using suction cups or magnets often make things worse, especially on thinner brass tubing.
If you can feel the dent under your fingers or notice a difference in response, it’s best to have it professionally assessed.
How Professionals Remove Dents
At Woodwind London, our brass technicians use specialised tools to reshape the tubing precisely:
Dent balls and rods – inserted into the tubing to gently push out dents from inside.
Mandrels and rollers – used on larger areas like bells to smooth out distortions.
Controlled heat treatment – helps restore metal memory without damaging lacquer.
Each repair is done carefully to preserve the instrument’s bore and finish, restoring both tone and appearance.
Preventing Dents in the Future
To keep your brass instrument dent-free:
Always use a hard case when transporting it.
Avoid resting it on chairs, sofas, or unstable stands.
Store it in a safe, dry place away from foot traffic or other instruments.
Have your instrument serviced regularly so minor dents are corrected before they worsen.
Book a Brass Dent Repair in London
If your trumpet, trombone, or horn has dents — big or small — bring it to Woodwind London in Muswell Hill. Our workshop can remove dents, restore alignment, and polish your instrument so it plays and looks as good as new.
Book your brass repair today and let our technicians bring your instrument back to its best.
