Probably your teeth are not aligned properly which makes you feel they are not in proper shape. please get that evaluated from a doc. If they are only malaligned then you can opt for brazes (wiring) treatment,or for caping. If they only in bad shape and are aligned properly, you can opt for caps (full coverage on teeth ), veneers
(partial coverage on teeth), which your doc can guide you by evaluating the situation. If they are malaligned and in bad shape, then opt for you can opt for either wiring treatment followed by capping or veneer, or you can directly opt for capping and veneering depending upon the spacing in between your teeth. please visit your doc and get the rite diagnosis done for the correct treatment.