When do you need to replace a tuba mouthpiece?

There is no set answer to how often a tuba mouthpiece should be replaced, as the frequency of replacement will depend on several factors, including the material of the mouthpiece, the frequency and intensity of use, and the individual player's preferences and habits. In general, however, most experts recommend cleaning the mouthpiece regularly and inspecting the cup and rim for signs of wear or damage. Some manufacturers also recommend routine maintenance or professional servicing to ensure the mouthpiece is in good condition. If the mouthpiece is damaged, cracked or deformed, then it should be replaced.