Table 2.

Characteristics of ACP containing toothpastes excluded studies.

Number	Study	Reason
1	Thanatvarakorn et al. [42]	In vitro investigation examining the effects of ACP on dentine tubule occlusion
2	Tirapelli et al. [43]	In vitro investigation examining the effects of ACP on dentine tubule occlusion
3	Winston et al. [44]	In vitro investigation examining the effects of ACP on dentine tubule occlusion
4	Charig et al. [45]	In vitro investigation examining the effects of ACP on dentine tubule occlusion
5	Fiocchi et al. [46]	Excluded due to the investigators examining DH as a result of vital bleaching
6	Giniger et al. [47]	Excluded due to testing effect of agent on vital tooth bleaching
7	Geiger et al. [49]	Excluded due to the lack of a negative control (the control group was a KCl product)
8	Yates et al. [50]	Excluded since the ACP was applied as an in-office agent and not as an OTC toothpaste