In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: AIM : The aim of the documentation of this clinical case is to make clinicians aware of " meth mouth " and the medical risks associated with this serious condition .
### Output Text:
AIM : The aim of the documentation of this clinical case is to make clinicians aware of " meth mouth " and the medical risks associated with this serious condition . 