
| bad breath | brown, stained teeth | ground-down teeth |
| black hairy tongue | gum disease and loss of teeth | receding gums |
| cancers of the cheek, esophagus, lip, palate and tongue | ||
| arsenic | formaldehyde | dirt |
| fertilizer | soot | pesticides |
| cyanide | manure | nicotine |
| dead bugs |