In 2017, the average patient in this practice spent $253. This is well below the average of about $1000 per patient per year. If you purchase these charts and continue the same pace and style of dentistry, you will break even in 2.4 years (assuming a 66% overhead). If you purchase these charts and offer more dentistry (which is commonly the case after purchasing a long-established practice), taking these patients to the average $1000/year, you will break even in just over 6 months. 630 charts for sale, refers out oral surgery, molar endo, severe perio, and ortho. 40% cash and 60% PPO.