Do CO2 cartridges expire and if so, how can you tell if they are still safe to use?

Yes, CO2 cartridges can expire. To determine if they are still safe to use, check the expiration date printed on the cartridge. Additionally, inspect the cartridge for any signs of damage or corrosion. If the cartridge is past its expiration date or shows signs of damage, it is best to replace it with a new one.