If it's just a one off then it's not too bad.
It is relatively normal for gums to bleed every now and again if you are brushing them with a really harsh tooth brush and often if you press on too hars with electric tooth brushes they can do this. So, if you've just got a new toothbrush this may be the cause. You can by toothbrushes that are flexible in several points to reduce pressure/ damage on the gums.
However, if it often happens it is a sign of gum/dental/peridontal disease caused by bacteria infecting the gums. This is usually caused by poor dental hygiene (ie not cleaning your teeth enough) but this is not always the case. Other signs are pain in the gums/teeth, loose teeth, reddening around where your teeth meet your gums, and the gums not coming down your tooth as far as they used to (gum line recession). As well as this your teeth may stary to become a grey sort of colour, if this occurs get them checked out as this is a sign that a tooth is badly rotten but by this stage you'd usually be in a LOT of pain and have already got it looked at anyway. If you show the above symptoms it is a good idea to see a dentist before they worsen and the problem becomes irreversible
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