Digression:
Details of how we did the searches (prior to combining using both "OR" and "AND")

Our term mapped to the Subject Heading Fluorosis, Dental:

We clicked the Subject Heading to see its Tree, which showed that it wasn't necessary to EXPLODE (since there weren't any more specific Subject Headings below Fluorosis, Dental):

Then we opted to include all subheadings:

We got 393 articles:

Next we searched for our second topic:

Our term mapped to the Subject Heading Tooth Bleaching:

We clicked the Subject Heading to see its Tree, which showed us that it wasn't necessary to EXPLODE:

Next we opted to include all subheadings:

We got 542 articles:

Now we typed our third topic and checked "Map Term to Subject Heading":

This mapped to a number of Subject Headings; Ovid had not checked any of them in the "Select" column, since it was not confident which was the right choice:

One of the Subject Headings, ENAMEL MICROABRASION, looked promising.

Since we weren't sure whether this was the right Subject Heading, we clicked the to find out more about it:

We also looked at the Tree for Enamel Microabrasion, which showed us that it was not necessary to EXPLODE:

We selected ENAMEL MICROABRASION and clicked "Continue":

Then we opted to include all subheadings:

We got 87 articles: