Gingivitis has a classic appearance, so that once you have seen a few examples, it is easy to spot. In gingivitis, the gums are swollen and inflamed. They are much redder, particularly just round the margins (where the teeth and gum meet). They will probably bleed on brushing, or gentle probing at the dentist. Often the dentist can see the dental plaque which hasn't been removed or disturbed by brushing; this is responsible for the gum inflammation.
To be able see gingivitis (as in the picture), takes about 5-7 days of plaque build up. That means you have missed brushing the gums in that area for an entire WEEK! Less obvious plaque build up can be highlighted by chewing a 'disclosing tablet" which does as the name suggests, and shows up any plaque on your teeth.
But 'I brush twice a day', I hear you say- well 'not ideally' would be my reply... Time to get back to the basics of good oral hygiene
We brush so often, that we commonly go into autopilot, which means we don't watch exactly where we are brushing, or check the technique we are using. We may be watching TV, or walking around the house while we brush, or we may be being distracted in someway- so if you have gingivitis, it is certainly time for a refresher.