Sparse teeth and large gaps at 40 years old can be improved by cleaning teeth, filling teeth and cosmetic dentistry. 1. Cleaning teeth: If the sparse teeth and large gaps are caused by periodontitis, you can clean your teeth by scaling and scraping to control the inflammation so that the gaps will not continue to get bigger. 2. Filling: You can choose resin filling to fill the gap in time and correct the symptoms of sparse teeth and large gaps. 3. Cosmetic Dentistry: You can choose the cosmetic dentistry method of stacking crowns on the outside of the teeth to increase the volume of the teeth, thus improving the problem of sparse teeth and large gaps. No matter which way, you need to go to a professional hospital for an interview. We suggest that patients should consult the doctor in time and choose the appropriate way to correct the problem under the doctor’s guidance, so as not to aggravate the symptoms.