Painful, sore, red gums can be a symptom of gingivitis (inflammation of the gums) or, more likely, periodontitis (inflammation of the attachment fibers of the teeth and supporting bone), which can arise due to a number of different causes.
klick (plural klicks) ( 1 slang, military) A kilometer. 2002, Robert J. Sawyer, Hominids an asteroid between one and three kilometers wide had slammed into the ground at fifteen klicks per second. ( 2 slang, usually in the plural) Kilometres per hour.
For most banner ads, the industry average seems to hover between two and five clicks per 1,000 impressions of the ad. That is, if a banner ad appears on 1,000 Web pages, between two and five people will click on the ad to learn more. Those five clicks per thousand impressions don't have much value to most advertisers.