Excluded studies	Reason for exclusion
Brough KM, Johnson, R (1988). Effects of Potassium Oxalate on Dentin Hypersensitivity in vivo [Abstract 1075]. J Dent Res 67(Spec Iss): 247.	Other report of included study (Muzzin, 1989)
Martineli ACBF, Pereira JC (2000). Treating dentin hypersensitivity with potasssium oxalate: a one-year evaluation [Abstract 1740]. J Dent Res 80 (Spec Iss): 361.	Other report of included study (Pereira, 2001)
Merika K, HeftitArthur F, Preshaw PM (2006). Comparison of two topical treatments for dentine sensitivity. Eur J Prosthodont Restor Dent 14(1):38–41.	No placebo or no treatment comparison group
Santos RL, Gusmão ES, Jovino-Silveira RC, Tenório SB, Barbosa RFS (2006). Avaliação clínica de dessensibilizantes obliteradores após raspagem periodontal / Clinical avaluation of obliterative desensitizing after periodontal scaling. Rev. Bras. Ciênc. Saúde;10(2):123–132.	No placebo or no treatment comparison group
Smith BA, Hansson RE, Caffesse RG, Bye FL (1988). Evaluation of dipotassium oxalate in the treatment of root hypersensitivity [Abstract 1733]. J Dent Res 67:329.	Other report of included study (Hansson, 1987)
Stewardson DA, Crisp RJ, McHugh S, Lendenmann U, Burke FJ (2004). The Effectiveness of Systemp.desensitizer in the treatment of dentine hypersensitivity. Prim Dent Care 11(3):71–6.	No oxalate treatment
Wang HL, Yeh CT, Smith F, Burgett FG, Richards P, Shyr Y, et al. (1993). Evaluation of ferric oxalate as an agent for use during surgery to prevent post-operative root hypersensitivity. J Periodontol 64(11):1040–4.	Post-periodontal surgery patients