Also not in your school but the whole family, (aged 6 to 40) use mouth guards at least twice a week. I would like to agree, a putty fitted mouthguards is always better than a boil and bite... We have had dentist ones, school fitted ones, home impression kit ones and boil and bite. There is only one specific type of boil and bite I would ever let my children wear. The troubles with boil and bite are that they tend to be harder to mould well, and are bulkier in the mouth when used. We use the brand named above for fitted mouthguards, they are excellent, the customer service is second to none, but they obviously are pricier than some.. The fit from the home impression kit is as good as the dentist fitted one I had before.
Type & design has pros and cons it's personal choice.. Happy to pm if you want more info.