How to overcome a serious fear of the dentist?

I for one was quite afraid of the dentist at one time, but I'm much better now. I think my fear of the dentist stems from two things: I had to have a cavity repaired once when I was a kid, so I needed to have it cleaned out first. The pain that seeped into the tooth bed when cleaning a cavity was like a death sentence for me when I was less than 10 years old. The variety of unknown tools in the dentist's chair was frightening. It wasn't until I tried most of the tools here myself that I grew out of my mischievousness with them as a child and lost half of my front tooth. After that, there is no treatment, the local medical facilities are quite simple. So with half a tooth with the band is 10 years long, until two years ago I was able to fix this half a tooth. It was a painful and long time ah the doctor first had to check if the half tooth was dead or not (if not, then keep the half tooth and work on it. If it is dead, then all the teeth will be extracted and replaced with dentures.) So, the doctor first drilled a hole in half of my tooth. Drilling holes in teeth doesn't really hurt. The drilling tool would punch the hole while spraying water. My half tooth was punched until it reached the bed of the tooth. Next came the scary part. A very long needle was inserted into this hole. The doctor inserted it while talking to me about telling her if it hurts. I remember this one vividly. It was quite painful when that needle was first inserted into the bed of the tooth! At this point the doctor would stop and send me for x-rays. After three iterations of this, I was finally left with half of my tooth. The next step was "processing". The final solution for the half tooth was to repair the half tooth and then put a full tooth (I don't know if you know what I mean by that) in order to fit the tooth, my half tooth had to be worn down mercilessly again. I still felt the same pain when it was being worn down, the soreness that seeped into the bed of the tooth as mentioned above, but luckily I could tolerate it. While the doctor was grinding, he was measuring with an instrument. It felt like measuring an electric current. At one end of the instrument was the syringe, followed by half of my teeth. When I moved it to different places, the thing would make a "ticking" sound, and in some places, it did not. The repair process was quite long! It was hard to keep my mouth open. The final procedure was fairly easy. But there was one painful procedure - without anesthesia, the reddish flesh around the root of half of the tooth was rubbed off! It was a bloody mess! It really hurt me to death! That would be the biggest dental surgery I've ever had, for crying out loud. Later, I had another big tooth pulled - the innermost one. It came up under anesthesia. Because of the anesthesia, it didn't hurt much. It's just that big teeth are so hard to pull. It was one of those big hammers with an awl on my tooth, and it was very hard. In the end, what came out was not a complete tooth, but broken into pieces. Sitting on the boat groggy and typing this much on my cell phone is a strain. Sleep.