This seems to be a result of poor oral hygiene. Make sure you get scaling and root planing done ASAP to prevent further recession of gums. Also post that please focus on your home care dental hygiene aids, like brushing, rinsing and gum massage.
Do not miss bed time brush
Use soft bristle brush
Pressure rinsing after meals is of great help
Yellow particle on ur tooth surface is calculus. U need scaling for ur teeth and need to visit d dentist for d same. Gingival recession , swollen gingiva and mobility are the signs of gingivitis progressing to periodontitis. So need to take up a call now.
use antiplaq mouthwash daily twice a day and maintain ur oral hygiene.
The yellow hard particles you observed are called calculus deposites. These deposites are hard and can not be removed with an ordinary toothbrush a proffessional scaling and deep cleaning is necessary for the removal of these deposites . These left untreated may lead to a condition called gingivitis ( swollen and loose gingiva leading to recession of the gums ) which you have started experiencing . Do visit a dentist as soon as possible so that there is no further damage .
Team Shambhala .
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