Hello The picture that you have attached is a bit unclear but if you see or experience tartar formation on your teeth that means some gum infection or gingivitis has started. It is the time to visit your dentist and get a round of teeth cleaning done. Because it will ultimately progress and you will start having sensitivity in your teeth or bleeding while brushing.

Following proper brushing technique with toothpaste & ultrasoft toothbrush is the crucial step to maintain oral health along with that eat lots of vitamin C rich fruits like aawla, oranges, strawberry etc. for gums health and overall  immunity . For cavity get in office consultation with dentist.

Hello dear Please be calm See gingivitis is there but calculus is not evident .but scaling is must to maintain hygiene.i suggest you to please get scaling done.for further details you can consult me Thanks