My son is due to have his braces removed this week. On the NHS they give only plastic retainers (like mouthguards) that should be worn every night (forever I am led to believe). I am not sure how practical that is for someone for the rest their life. I’ve been told by several people that really the only way to go is to have fixed metal retainers put on the inside of both the top and bottom teeth. Are there are there any dentists on here or other knowledgeable people that could give me some advice on this? Is this highly recommended? Are there are downsides to this? Please could you also confirm if there are different types of fixed retainers which might assist with good dental hygiene, for example, the ability to floss between teeth? Thanks very much.