Malik bin Anas (may Allah have mercy on him) mentioned some people's removing their moustaches down to the root. Imam Malik (may Allah have mercy on him) said: Whoever does such a thing deserves to be reprimanded, for there is no hadith from the Prophet (peace and blessings be upon him) about removing the moustache down to the root; rather, one should trim from the side of both lips and the mouth. Malik bin Anas (may Allah have mercy on him) said: Shaving the moustache from the root is an innovation that has appeared among the people.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 699