People with bruxism, do you think your bruxism was caused by poor dental work?

The condition of bruxism has been studied extensively. Decades ago it was thought that tooth allignment (bite) was the cheif cause, now numerous studies have shown that tooth alignment and dental work have little to do with causing bruxism. The strongest "cause" has been shown in numerous psychological studies to be over stimulation of musclular control in the central nervous system. This is why "occlusal splints" to protect the teeth are so important, because this occurs subconsiously.

Excellent oral hygeine and occlusal splints will be the best way to keep your teeth healthy and minimize the effects of bruxism.

It sounds like you have a mild case of bruxism only. As long as it stays that way, it isn't of much concern, you're going to wear down your teeth some just from eating anyway. Most likely you don't brux daily, but only when you are stressed or tired or have some other concern. But if you want a mouthguard there is no reason for you not to have one. Your dentist can make you a guard that is specifically for bruxers and not for sports. Normally called night guards, they are also known as 'bruxism splints'. It won't stop you from bruxing but it will protect your teeth from further wear. These are better than store bought sports mouthguards because they are made using impressions of your teeth, so they'll fit a lot better and work better to meet your needs.

poor dental work can be one of may reasons why people brux

Rarely. Anxiety more likely.