Table 1.

Search strategies in online databases.

Database	Search Strategy
PubMed	((fluoride) AND ((ADHD) OR (attention deficit hyperactivity disorder))
Embase	(‘fluoride’/exp OR fluoride) AND (‘adhd’/exp OR adhd OR ‘attention deficit hyperactivity disorder’/exp OR ‘attention deficit hyperactivity disorder’ OR ((‘attention’/exp OR attention) AND deficit AND (‘hyperactivity’/exp OR hyperactivity) AND (‘disorder’/exp OR disorder)))
Web of Science	fluoride AND ADHD