Using the third person singular after does instead of the infinitive without to – To make negatives
The man doesn’t waters the flowers.
The man doesn’t water the flowers.
The answer to a question beginning with Does is always in the present tense,
third person: Does he like the cinema?
Yes, he likes the cinema, or Yes, he does.
After the auxiliary does use the infinitive without to, and not the third person of the present.