As-Salaam alaikum,
Says the Noble Prophet Muhammad, Sallallahu alaihi Wasallam: ''INNAMAA BU'ITHTU LI-UTAMMIMU MAKAARIM AL-AKHLAAQ.. I have been sent to perfect the best of conduct (your behaviour and character).'' [Bazzaaar]

The Prophet, Sallallahu alaihi Wasallam, was sent to perfect the characters of the Ummah without overlooking anything, making us immaculate, removing from us corrupt traits and taking us from jahiliyya (ignorance) to belief, from evil acts to good deeds.
Allahu Tabaraka Wa Ta'ala has commanded us to fulfill orders and leave prohibitions, such as bad character traits, and the orders are the categorical obligations. Bad traits are those we grow up with, such as lying, envy, avarice, anger etc
Generally, our deeds in dunya are neither perfect nor perfected, so since the Prophet, Sallallahu alaihi Wasallam, was ''sent to perfect characters'', he himself, will perfect our good characters and remove us from bad characters into the Ocean of Excellent virtues... and bring us among believers in the very best, pure and perfected state on the Day of Resurrection.
What do you think when you hear the Prophet, Sallallahu alaihi Wasallam, said: ''Whoever sends Salaat on me once, Allah sends Salaat on them 10 times''? For us, a single Sallat ala Nabiy realizes absolute goodness and perfection because the blessings of Allah on us is not like ours. What do you think when we recite Salawaat ala Nabiy in our own deficient way only once, and Allah blesses us ten times? Does not such Divine Salawaat purify us? One single Salawaat of Allah is enough to purify the entire Ummah and grant it entry to Paradise without account! Look at [this] Divine Generosity!! Allahu Akbar!!