After melting the product , the actual plastic mould wouldn't fit on to my teeth to make the mould , it's a cheap alternative and I don't recommend it . I retried melting it twice and it did not work it went up on to my gums did not take a accurate mould of my teeth , then I could not get it out of the plastic mould it actually broke . I don't recommend this product, I have thrown mine in the bin total waste of money !