How many taste receptors do we have?

Humans have receptors for five basic taste classes: sweet, bitter, salty, umami, and sour. These receptors are proteins located on the surface of taste receptor cells. Each taste bud typically contains around 100 taste receptor cells, and these cells can be of any of the five types. Therefore, each taste bud is capable of detecting all five basic tastes. Contrary to popular belief, there is no specific location for each taste on the tongue; all areas of the tongue contain receptors for all taste types, although there might be slight biases—for example, bitter receptors are somewhat more concentrated at the back of the tongue 1 2.