PubMed/MEDLINEPubMed comprises more than 22 million citations for biomedical literature from MEDLINE, and life science journals. Citations may include links to free full-text content from PubMed Central and publisher web sites.
MeSH (Medical Subject Headings - http://www.ncbi.nlm.nih.gov/mesh) is the NLM controlled vocabulary thesaurus used for indexing articles for PubMed.
The following suggested MeSH terms can be used to refine search results:
Oral health and any of the subheadings
Mouth neoplasms
Mouth diseases
Oral health and any of the subheadings
Mouth neoplasms
Mouth diseases
"Dental" and the concept you are looking for e.g. restorations, occlusion, education, infection control, plaque index etc.