OLP	oral lichen planus
LP	lichen planus
OSCC	oral squamous cell carcinoma
TCSs	topical corticosteroids
CP	clobetasol propionate
TA	triamcinolone acetonide
TCIs	topical calcineurin inhibitors
TAC	tacrolimus
AV	aloe vera
NOG	nitrous oxide gas
PDT	photodynamic therapy
LLLT	low-level laser therapy
PBM	photobiomodulation
CHX	chlorhexidine
RCTs	randomized controlled clinical trials
PROSPERO	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
VAS	visual analogue scale
MB	methylene blue