In Genesis 49:12, "teeth whiter than milk" signify the Celestial Spiritual [milk] in the Lord's Natural [teeth], where Judah is here representing the Lord. (Arcana Coelestia 2184-2185).

In Psalms 3:7; 37:12, 58:6; Matthew 8:12, teeth signify the lowest natural things in man: in the genuine sense, their truths, in the opposite sense, their falsities. So the gnashing of teeth signifies the collision of falsities with truths. (Arcana Coelestia 4424[3])

In Exodus 21:27, this signifies truth in the natural, here the ultimate, which is the sensuous. (Arcana Coelestia 9062)

The tooth signifies the corporeal proprium, which is the lowest degree of man. (Arcana Coelestia 10283[12])

'Teeth,' as in Genesis 49:12, in the genuine sense, signify the natural level of life. Any hard part of the body, like bones and cartilage, corresponds to the truths and goods of the lowest natural level. 'Teeth' signify the outer edges of the life of the natural self, or the sensory level. There is a natural sensory will, and a natural sensory understanding. When the sensory levels are separated from the interior of the mind, their supposed truths are really mere falsities, and do violence to truths and destroy them. This situation appears in many passages, because sensory people do not see any truth in its own light, but engage in reasoning and altercations about everything... These altercations are heard in the hells as the gnashing of teeth. Viewed in itself, this is the collision of falsity and truth. This is the meaning of 'gnashing of teeth' in Matthew 8:12, 13:42, 50, 22:13, 24:51, 25:30, and Luke 13:28.

(Odkazy: Apocalypse Revealed 435)

5786. 'behold, we are my lord's slaves' means that they are to be deprived for ever of their own freedom. This is clear from the meaning of slaves' as being without any freedom of their own, dealt with in 5760, 5763. What is meant by being deprived of the freedom of one's own has also been stated in the paragraphs that have just been mentioned; however, since it is an extremely important matter, let it be restated. A person has both an external man and an internal man. The external man is the means through which the internal man acts; for the external man is merely the organ or instrument of the internal. This being so, the external man must be made wholly subservient and subject to the internal; and when the external man is subject to the internal, heaven acts on the external man by means of the internal man and makes the external man conform to things such as are of heaven.

[2] The opposite occurs when the external man is not the servant but the master. The external man is the master when a person has the pleasure of the body and the senses as his end in view, especially when the objects of his selfish and worldly love and not the things of heaven are his end - to have as his end in view being to love one and not the other. For when a person has those objects as his end he no longer believes that there is any such thing as an internal man or that within himself there is anything that will be living when his body dies. In his case the internal, since it does not hold the position of the master, is merely the servant of the external, employed to enable thought and reasoning against what is good and true to take place; for in this person's case no other kind of influx by way of the internal is available. This is also the reason why people like this utterly despise, indeed recoil from the things of heaven. From all this it is plain that the external man, which is the same as the natural man, ought to be wholly subject to the internal or spiritual man, and consequently should exist without any freedom of its own.

[3] Freedom of one's own consists in giving oneself up to every kind of base pleasure, despising others in comparison with oneself, and making them subject like slaves to oneself. Or else it consists in persecuting others, hating them, being delighted when bad things happen to them - especially things done to them by one's own designs or by the use of deceit - and wishing to see them dead. These are the kinds of things that come from indulging one's own freedom. From this one may see what a person is like when he exercises this type of freedom, namely a devil in human form. But when he loses this freedom he receives a heavenly freedom from the Lord, the nature of which is completely unknown to those exercising the freedom of their own. They imagine that if the freedom of their own were taken away from them no life at all would remain. But in actual fact this is when true life has its beginning and when true delight, blessing, happiness, and wisdom arrive, because this freedom comes from the Lord.