Botox is not generally used on the cheeks or for lines around the mouth, as it is a neuromodulator which works by inhibiting muscle movement that causes wrinkles. Botox works wonderfully for expression lines such as crow’s feet or forehead lines, but for perioral lines a dermal filler or laser resurfacing treatment may be a better option as these will not inhibit muscle movement that affects talking, chewing, or other mouth movements. Botox can be used in small quantities to help the resting frowny face or turned down mouth. Only experts in injection techniques can do this safely. For the cheeks themselves, there are dermal fillers available that can add volume, such as Juvederm XC or Restylane Lyft. I recommend visiting a board-certified dermatologist and telling them exactly what your goals are, so that they can help to find the best treatment for you.