I have a white hard buildup on my teeth???!

I have a white hard buildup on my teeth???

I belive that it is on my bottom teeth in my mouth, the middle molar on the left has started a hardbuildup and it is pretty big and i just noticed it on the outside of the tooth on the side crevice

a tiny spot of what appears to be the same thing has started on my right molar

it is also whiter than my teeth and is very hard

what is this? and is it treatable?

thx

4 days ago
it is also like a little bump coming off the side of my teeth

well its calculus deposit , which is most commonly found at crevices of teeth, yes of course its treatable get cleaning or scaling and polishing done by hygienist and emphasise more towards brushing properly and flossing regularly or if it progresses it may cause cavity or gum dieseases!