I tend to write very long sentences. To easily detect sentences that are too long, I would like to make individual sentences stand out more clearly in my compiled latex document. I know that latex has some way of detecting the end of sentences to adjust the spacing. So is it possible to modify latex's detect-end-of-sentence function so that a highly-visible special character, say a
$\bullet$, is inserted at the end of each sentence?
(Any other ideas to highlight sentences are very welcome.)