Question: If one side of a person’s beard is longer than the other, is it allowed for him to straighten it if its form distorts the face?
Answer: “What is apparent, and Allah knows best, is that a person does not do this. A person does not do anything [to change it]. Allah created the creation [i.e. this person in this form]”.
[Sharh Tirmidhi no. 300]
Faisal Ibn Abdul Qaadir Ibn Hassan