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Aim The aim of this study is to evaluate the effect on cell viability, the antibacterial activity against cariogenic bacteria, and the total bioavailability of commercially available children’s toothpastes in Thailand.Materials and methods Seven toothpaste slurries were prepared from seven commercial toothpastes for children. Total fluoride concentration was determined. Agar diffusion method was used to examine the antibacterial effect of toothpaste against Streptococcus mutans. The viability of L929 mouse fibroblasts exposed with different concentrations of each toothpaste slurry was tested by MTT assay.Results Fluoride concentration in fluoride containing toothpastes was ranged from 521.36 to 1377.83 ppm. Two toothpastes exhibited a similar level of fluoride concentration compared between the product labels. Other toothpastes showed the difference or slight difference in fluoride concentration between the companies’ information and our data. Zone of inhibition was ranged from 0-2.08 cm. Significant higher zone of inhibition was observed in toothpastes with sodium lauryl sulphate. The concentration of toothpaste that reduced cell viability to be less than 50% of the control was 0.8%, 3.1%, 6.3%, 6.3%, 25% and 100% for Fluocaril Deli Fruity, Oral-B Junior 6+, Kodomo kids, CUdent Stevia, Sun Star GUM and Kindee Organic, respectively.Conclusion The examined children’s toothpastes can inhibit the growth of S. mutans which did not correlate with fluoride concentration. The antibacterial effects could be the results of other ingredients, for example sodium lauryl sulphate.