Step 1: After you've run a search in PubMed, use the left-hand filters and keep scrolling until you see the box that says Additional filters.
Step 2: Select Additional Filters
Step 3: Once in Additional Filters, select Journal. Check the box next to Dental journals and select Show. Note: Your filter is still not applied, see next step!
Step 4: Journal will then display in the left-hand filters menu. Check the Dental journals box!