Swollen gums/growth

4 year old male Bernese mountain dog He is showing no signs of discomfort but i just noticed that his gums are significantly swollen and there are two areas of growth from his gums (showed in front of his front teeth) He was at the vet in May with none of this noticeable. I do dental care on him but it’s been about 3 weeks - there was nothing of noticeable major concern the last time we brushed about 2 months ago i got him new Oravet dental chews (box say to give 1 a day- he probably gets about 4-5 a week) He had lost some weight which we noticed a few weeks ago - so have been closely monitoring his foot intake and he has gained some back (he is also a large breed with tons of hair in the summer so we thought it could be linked to that). We also switched the flavor of his dog food recently (same brand/type - just went from lamb to turkey)   any thoughts??   

Hello - perhaps it is stating the obvious to say that the gum appears to be overgrown around the base of the teeth.  Different oral (mouth) masses / overgrowths can look very similar to one another, and there are a range of possible causes, which may be difficult to separate.  These include cancer e.g. fibrosarcoma or a reaction to certain drugs that a dog might be on, or a reaction to periodontal (dental ligament) disease / inflammation.  The Burmese Mountain Dog is thought to be commonly affected with gum overgrowth ('gingival hyperplasia') partially due to its genetics and despite its benign-sounding name, certain types of the condition may spread intensively and invade the bone, so an early visit to the vets may prove important.  They might wish to take samples or to perform dental radiography in order to find more information about what is going on in your own dogs' specific case.  Important questions for your vet are:  what do you think is going on?  How sure can you be and will radiographs / biopsies improve that knowledge?  As well as, What can be done differently if we identify the cause.  I hope that something here is helpful.