Gap bewtween front teeth. It will cost?

First we'll have to rule out any underlying reason for the gap. For that a clinical examination and an intra oral X-ray will be essential. The the treatment plan will be based on the diagnosis.The treatment also depends on how much gap you have. If the gap is minimum, you can have bonding. Composite bonding may not be that strong to withstand biting forces. If you want better strength, you may have to go go for either crown(s) or veneers. Again the number of units to be restored depends on the amount of gap between your teeth. Even the cost of treatment can be fixed only after diagnosis. Kindly consult your dentist. He'll give you the best solution which with suit both your functional and financial requirements. Thank you.