<em style="color: rgb(0, 0, 0);">Don't</em> is used when speaking in the first and second person plural and singular and the third person plural ("I," "you," "we," and "they"). It can be used to make a negative statement:
<em style="color: rgb(0, 0, 0);">Doesn't</em>, on the other hand, is used when speaking in the third person singular only ("he," "she," and "it"). Like <em style="color: rgb(0, 0, 0);">don't, doesn't</em> is used to make negative statement
Ex.Does Eduarda speak English well? No, she doesn't :)