i help you build a cave, a bridge of silver and crown of gold, am very small but people are afraid of me won't let me help

Please clarify your question. To what are you referring?

this is a riddle

dentist's drill?

It seems like you're describing a riddle or a puzzle. The riddle suggests that you have the ability to help build a cave, a bridge of silver, and a crown of gold, yet people are afraid of you and won't let you help. Let's break it down step by step to figure out the answer.

1. Cave: Building a cave could refer to digging or excavating. This suggests that you possess some kind of digging ability.

2. Bridge of silver: Building a bridge often involves construction work. In this case, the bridge is made of silver, implying it requires specific skills or materials to create.

3. Crown of gold: Crafting a crown typically involves intricate jewelry-making skills. This suggests that you possess the expertise to create delicate and beautiful objects.

4. Being small and people being afraid: The riddle mentions that you are very small, and people are afraid of you, which is why they won't let you help. This clue is crucial in finding the answer.

Given these clues, the answer to the riddle is most likely "a spider." Spiders are known for their ability to weave intricate webs, which can resemble caves. They also spin silk, which can be compared to silver threads for building a bridge. Lastly, some spiders have gold or yellow markings on their bodies, resembling a crown of gold.

So, the answer to the riddle is a spider. People are often afraid of spiders and may not want their help, despite their abilities in building intricate structures.