what's the politest way to tell my friend that her son smells like ear wax (for some reason)?

I couldn't help but smell your earwax breath would you like me to get you a mint or some chewing gum.

Helping hum use peroxide to clean his ears, or taking him to see a doctor

Straight forward.

Is there anything else about him that's apparently unusual? I'd maybe work your way toward that focusing on health concerns