My face is uneven. the right side is sunken in leaving a moon shape profile but my left side is full and plump why is this i am not missing teeth! ?

We are symmetrical: We are not symmetrical creatures. Everyone is asymmetrical. If this asymmetry is a recent development a medical advice needs to be seeked.

See your surgeon: It is usually due to soft tissue tissue difference. If the chewing muscles on one side is used more often for chewing, it can be bigger when compared to the other side. It can also be due to difference in amount of fat pads in the cheeks, like that of baby's cheeks. Some times it is due to a tumor, infection, or other pathology. An evaluation by a surgeon is advised.

Masseter hypertrophy: Clenching and grinding your teeth may increase size and appearance of masseter muscles and completely change facial appearance. Botox is an excellent treatment option to soften, relax, and return facial shape to normal size.

R/O TMJ : TMJ can be very difficult to treat and overlap several specialists. I hav had the best results with ENT and oral surgery. . It can start with a poor bite due to genetics/after trauma/Bruxism secondary to stress. A good nite guard is essential. topical Voltaren (diclofenac) gel and a low dose muscle relaxant like skelaxin/FLEXERIL /BOTOX/LIDOCAINE injections can help. Prednisone with quick taper may help.