These gadgets are a wonderful invention for those of us that might have a larger space between their teeth and continually get food stuck in there and are at an increased risk of cavities. This also does wonders for receding gum lines as it massages the gums and helps them to grow tighter around the teeth. Two of my molars had a larger gap between them and my dentist was always concerned about decay. I started using these on a regular basis and they not only helped keep the area clean, they also helped grow back the gums in that area so I don't have that issue anymore. I began to use it on all my teeth and found it did the same everywhere. Now instead of struggling with potential gum diseases down the road, my dentist says my gums look healthy! Note that it will cause soreness in the beginning when you use them, but I found that after using them for a continued time it didn't bother me at all.