Dentists Warn Of Harmful ‘Mask Mouth’ Disease Periodontal disease caused by extended wearing of face masks is just one more health problem to add to the growing list of adverse effects. This can lead to strokes and increased risk of heart attacks. ⃠TN Editor Some bad breath just can’t be covered up. Now that dentists have reopened their doors, they’re having patients show up with a nasty set of symptoms, which the doctors have dubbed “mask mouth.” The new oral hygiene issue — caused by, you guessed it, wearing a mask all the time to prevent the spread of...