"Selena Gomez just endorsed Pantene Shampoo and she has beautiful hair, so Pantene will make my hair beautiful too."
What kind of fallacy is that?
Making Hasty Generalizations
Jumping on the Band Wagon
Assuming something is true because it hasnt been proven wrong
cAppealing to false authority 2100100

Cappealing to false authority 2100100

Explanation:

Selena's hair always looks beautiful and 2 she could use other products in her hair

postive, comparative, superlative - good, better, best

recall how we defined nouns as words capable of having plurals and possessive endings. adjectives (and their first cousin, the adverb) also have a feature that distinguishes them. they come in three states. first, the raw adjective—in its positive state—merely describes the noun modified; it doesn’t care about how this particular person or thing stacks up against other members of the same noun class