Mouth Guard Size Charts: Helpful Guidelines

The table above provides a Universal Mouth Guard Size Chart, covering sizes from Junior through to Adult, including oversize adult options. It is designed to give you a clear overview of typical mouth guard sizing based on age group and jaw size. Many models also feature boil-and-bite adjustability, allowing for a more personalised fit. This makes it easier to find the right fit across age groups when shopping online.

However, please note that sizing can vary slightly between brands, so this chart should be used as a general reference only. If a specific product has a brand-supplied size guide, you’ll find it listed in the product description—we recommend referring to that first for the most accurate fit.

Considering More Than Just Size

In addition to choosing the correct size, it is also important to consider the material, style, and intended use of the mouth guard. For example:

• Boil-and-bite guards – Popular and widely available; softened in hot water and moulded to your teeth for a semi-custom fit.
• Custom-fit guards – Made from dental impressions; offer the most precise fit, maximum comfort, and protection, but come at a higher price.
• Orthodontic guards – Specifically designed for players with braces; allow for tooth movement while still protecting against impact.
• Single vs. double guards – Single guards cover the upper teeth only, while double guards protect both upper and lower sets; the latter may restrict breathing but provide extra protection.
• Material thickness – Thicker guards provide greater protection but may feel bulkier; thinner versions are more comfortable but best for lower-contact sports.

Choosing the Right Size

• If you’re between sizes or unsure, we generally recommend sizing up for added comfort and full coverage.
• This is particularly helpful for growing children, teens with changing jawlines, or adults requiring extended protection.

Why This Guide Matters

We know that finding the right mouth guard size can sometimes be a challenge — especially with the wide range of designs, brands, and fit systems available. That’s why we’ve created this comprehensive Mouth Guard Size Chart Guide to help you make confident, informed decisions when shopping online with us.

Final Note

This general guide is a helpful starting point, but it’s important to remember that mouth guard sizes can vary slightly between brands, styles, and sports requirements. Whenever possible, we strongly recommend checking the brand-specific size guides provided on our product pages for the most accurate fit.

✅ Pro Tips for Measuring Mouth Guards

• Measure age/jaw size: Refer to the recommended size chart to determine the right category: junior, youth, or adult. Ensuring a correct starting size makes moulding or custom fitting easier and more effective.
• Check boil-and-bite adjustability: For boil-and-bite guards, soften in hot water and mould carefully to your teeth. A properly fitted guard should feel snug against the teeth and gums without restricting breathing, speaking, or comfort.
• Test retention: Once fitted, the mouth guard should stay securely in place, even when your mouth is slightly open or during active movement. Guards that slip or move may reduce protection.
• Consider braces: If you wear braces, always select an orthodontic-specific guard. These are designed to protect teeth and braces while allowing natural tooth movement and minimising irritation.
• Replace when needed: Mouth guards are consumable safety equipment. Replace them every season, or sooner if you notice damage, excessive chewing, deformation, or if it no longer fits snugly. Proper maintenance ensures maximum protection and hygiene.

Brand-Specific Size Guides

On our website, you’ll find these brand-specific size guides directly under the product description on each product page. These charts are provided by the manufacturers and are the most accurate reference for that particular brand. If a brand-specific guide is listed, we encourage you to follow it rather than relying solely on this general chart.

Below is a list of brands currently stocked by A7 Sports, each offering its own brand-specific size chart for reference: