Clive Leatherdale said this quote

“ With this and this - and he touched one of the canine teeth and that below it - the little children can be bitten. Unaesthetic as it may seem, vampires bite out of one side of the mouth, and one side only, which is only common sense. The upper canines in themselves are little more than daggers, useless in tearing flesh without employing the lower canines to help pin the skin together. Preoccupied with the erotic, the cinema necessarily rides roughshod over such technicalities. ”