One is usually enough.” However, you may need to cover both the upper and lower teeth to prevent snoring-induced grinding. Two experts I spoke to — Dr. Michael Gelb, who treats patients with ...

The portable device, shaped like the mouthpiece of a recorder, can be plugged into any smartphone, tablet, or PC with a USB-C port, effectively transforming it into a musical instrument.

"The sound that a congested child makes is stertor," Walsh says. "It's almost like a snoring sound that indicates congestion in the mouth and nose." Stertor can happen with a common cold. It can also ...