Perhaps you should try some spelling variations:
decrease periodontal » increased periodontal (Expand search), disease periodontal (Expand search), diseases periodontal (Expand search)
periodontal effect » periodontal effects (Expand search), periodontais effect (Expand search), periodontal defect (Expand search)
faster decrease » rate decrease (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
decrease and » decreases and (Expand search), decrease of (Expand search), decrease the (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease in decrease AND decrease ) OR ( decrease faster decrease periodontal effect ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease in decrease and decrease ) OR ( decrease faster decrease periodontal effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decrease and decrease ) OR ( decrease faster decrease periodontal effect ))*.