One of the most challenging problems to grow tomato indoor is polination. I find that using an eletric tooth brush is very effective. I use a Sonic Oral-B with 3 different speeds and I find the middle speed is the most effective. I can see pollens busting out from the flower during vibration. Since I use the brush, no single flower is fallen. Here is the display of my indoor vegetable garden:
https://www.youtube.com/watch?v=JNLqh0xOJrA