According to an article on about.com, the verdict is: No, it’s not wrong at all.
According to a usage note in the fourth edition of The American Heritage Dictionary:
But may be used to begin a sentence at all levels of style.
And in The King’s English (1997), Kingsley Amis says that:
The idea that and must not begin a sentence, or even a paragraph, is an empty superstition. The same goes for but.
The same point was made over a century ago by Harvard rhetorician, Adams Sherman Hill in his 1896 seminal, The Principles of Rhetoric:
Objection is sometimes taken to the use of but or and at the beginning of a sentence; but for this there is much good usage.
In fact, it has been common practice to begin sentences with a conjunction since at least as far back as the 10th century!
Still, the myth persists that and and but should be used only to join elements within a sentence, not to link one sentence to another, because not everybody loves an initial but.
In reflection of this, the authors of Keys for Writers (2014) note that:
Some readers may raise an eyebrow when they see and or but starting a sentence in an academic paper, like term papers, school projects, academic essays, especially if it happens often.
So if you don’t want to see eyebrows raised, limit your use of these words at the beginnings of sentences.
See Also: PREPOSITIONS: Is It Wrong to End Sentences With Them?
