API	Approximal Plaque Index
BOP	Bleeding on Probing
CI	Confidence Interval
CPITN	Community Periodontal Index of Treatment Needs
DAI	Dental Aesthetic Index
DL	DerSimonian–Laird random-effects model
GB	Gingival Bleeding
GBI	Gingival Bleeding Index
GI	Gingival Index
GRADE	Grading Recommendations Assessment, Development and Evaluation
IOTN	Index of Orthodontic Treatment Need
NNOT	Normative Need for Orthodontic Treatment
NOS	Newcastle–Ottawa Scale
OR	Odds Ratio
OHI-S	Simplified Oral Hygiene Index
PD	Pocket depth
PI	Plaque Index
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PROSPERO	International Prospective Register of Systematic Reviews
STRAIT	Standardized Technique for Recording Alignment of Individual Teeth
TMD	Temporomandibular disorders
TPI	Treatment Priority Index
VPI	Visible Plaque Index