To close the gaps with composite cement is a viable option if the gap is not too big. The two adjacent teeth will be built up equally with cement in order to close the gap and yet maintain esthetics. However, this cement has every chance of chipping off with the usual wear and tear. Also, it gets discoloured often and has to be changed every few years. This might cost you around 1000 to 2000 rupees depending on the clinic, doctor etc.
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A better and permanent option is get orthodontics treatment (braces) done.