Not able to install "ToothGrowth" package

I am trying to install a package using "install.packages("ToothGrowth")". but I am getting following error:
Warning in install.packages : package ‘ToothGrowth’ is not available for this version of R.
PLESE SOMEBODY HELP ME WITH THIS.

it is a dataset, not a package so you should try the function data().

data(ToothGrowth)

head(ToothGrowth)
# 
# > head(ToothGrowth)
# len supp dose
# 1  4.2   VC  0.5
# 2 11.5   VC  0.5
# 3  7.3   VC  0.5
# 4  5.8   VC  0.5
# 5  6.4   VC  0.5
# 6 10.0   VC  0.5
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