First let me commend you for taking care of your skin and particularly for protecting it from the sun. Hollowness of the cheeks (and elsewhere in the face, such as the temples, cheeks, and around the eyes) has a signficant constitutional component and, as is apparently your case, can occur despite one's best efforts.Fortunately, nowadays, we can quickly and safely contour and smooth out hollowed cheeks (and the other hollows mentioned, as well) with the appropriate use of volumizing fillers (not simple fillers used to treat fine lines and wrinkles). These volumizing fillers include Radiesse and Voluma (which I would use alone or in combination in my Upper East Side Manhattan office) and Stylage XXL and Emervel Volume (my favorites in my Israel satellite facility, where a far greater number of regulatory agency approved injectable fillers and volumizers are available). The entire procedure takes about ten to fifteen minutes to perform and the results are typically immediate and extremely gratifying. There is ordinarlily little to no significant downtime.In general, the results within the cheeks, when properly performed, tend to last up to two years. How much material and which ones (or combinations) would be most appropriate for you are best determined at the time of consultation. Finally, as to how much this type of procedure would cost, I personally set my fees according to the global job, not by the number of syringes. When a person undergoes surgery, the surgeon quotes a global fee for the procedure, for whatever it takes to get the job done right, and not according to each packet of suture material or number of gauze pads used. Likewise, once the fee for nonsurgical augmentation is determined for a particular patient, that fee remains the same whether three syringes or five or more of varying types are needed to complete the job. This contrasts sharply with less experienced and novice physician injectors that have recently flooded the field who attempt to entice customers by selling their treatments flea market style by the syringe.