Tea Tree and Reduced Plaque Index

Safety in these studies

Overall tolerabilityReportedThe incidence of adverse events was statistically significantly greater in the CHX group than in the TTO group.
The incidence of adverse events was statistically significantly greater in the CHX group than in the TTO group.
from: The Effect of Local Application of Tea Tree Oil Adjunctive to Daily Oral Maintenance and N
unpleasant tasteReportedreported in three out of four studies
However, an unpleasant taste was reported in three out of four studies.
from: The Effect of Local Application of Tea Tree Oil Adjunctive to Daily Oral Maintenance and N

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The Effect of Local Application of Tea Tree Oil Adjunctive to Daily Oral Maintenance and Nonsurgical Periodontal Treatment: A Systematic Review and Meta-Analysis of Randomised Controlled Studies.