The white/ yellow patch around your teeth is known as plaque or tartar, which can be easily removed by proper cleaning and polishing of teeth.
When this plaque is not removed it causes inflammation (redness) in the gums as it contains millions of microorganism which release toxins and chemicals that can damage the tooth support by loosening the gums and dissolving the underlying bone.
It also causes bad breath, cavities, and other periodontal problems like loosening of teeth and eventually loss of tooth support.
Hence it is very important to get your teeth cleaned.
Next Steps
cleaning and polishing
Health Tips
salt water rinses will help.